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[Youtube] LN882H module pinout and setup for flashing - step by step video guide

p.kaczmarek2 13596 207

TL;DR

  • A step-by-step video shows how to flash the LN882HKI/LN882H module and set it up for cloud-free OpenBeken use.
  • The process uses soldered wires, grounds one BOOT pin, and then flashes new firmware over UART, much like ESP8266 recovery.
  • As of 2026, read/write support also works with BK7231GUIFlashTool, replacing the legacy flashing tool for the same wiring setup.
  • After flashing, the firmware can pair with Home Assistant and later enable features such as DHT11 support, SSDP discovery, and Tasmota Control via OBK scripting.
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  • #31 21441525
    niterian
    Level 9  
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    p.kaczmarek2 wrote:

    @niterian Are you looking for other tools because flashing does not work for you? Then please show your connections. I don't think that the tool is at fault.


    I don't think it's the tool's fault either. I was looking at other tools to try to understand what I'm supposed to see on the wires.
    I've flashed 6 BK7231N/BK7231T/T34 based devices, all through uartprogram. I wasn't able to get the "official" Windows-based GUI tool to work correctly under Linux and just decided that a simpler open-source tool is easier to debug.

    I'm not ready to ask for help. I have a few things to try. My main suspicion is that my 3.3V supply is not good enough. I had way easier time flashing when I was able to reuse the on-board AMS1117 voltage regulator than powering from my cheap PSU (Yihua 305D). When reading would often start talking talking to the flash and then after a few seconds fail. Writes wouldn't even start, I assume they are more power intensive.

    I have a few spare AMS1117s, so the next step is to try it.
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  • #32 21443865
    niterian
    Level 9  
    Posts: 12
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    >>21441525

    I was finally able to flash LN882H (WL2S).

    I've switched to powering it from https://botland.store/power-modules/1482-supp...ontact-plates-mb102-33v-5v-5904422300739.html which is really just AMS1117-3.3V in a convenient form with all the necessary capacitors. Later it turned out to be unnecessary. My PSU worked just fine.

    I had to pull out my logic analyzer to finally find out that my FTDI232-based UART wasn't actually sending anything on the TX line.
    I've changed it to a CH340G-based UART ( https://pl.aliexpress.com/item/1005006880183678.html , CH340G-2) and it worked just fine with LN882Loader.
    I've also tried another FTDI232-based UART ( https://pl.aliexpress.com/item/1005006157753097.html , Red) and it also worked.
    Strange, given that I've flashed 6 BK7231 chips with the old FTDI232 UART.

    I've tried running the LN882H_V1.0.16 Windows-based tool under wine on Linux with no luck. It might be that I don't know how to pass the correct COM port, given that a Linux equivalent is /dev/ttyUSB0 or similar.

    The tyutool_cli successfully communicates with the chip, but it just doesn't allow reads. It exits with "Don't support read.".
  • #33 21446370
    p.kaczmarek2
    Moderator Smart Home  
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    Good job @niterian

    I'm testing another LN882H device and I have a question to anyone who can do checks on another LN882H piece - can you click through all pins in GPIO doctor without getting WDT reboot?
    User interface of the GPIO Doctor tool with visible GPIO pins and configuration options.
    @divadiow (I'm not sure who else has LN882H at hand)
    I'm on 1.18.42
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  • #34 21446397
    divadiow
    Level 38  
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    from memory GPIO dr does cause some issues for me and I sometimes have to power off/on but I don't recall investigating the cause and seeing WDT. I put it down to some GPIOs not being happy about high or low pulling, but that's an assumption.
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  • #35 21446441
    p.kaczmarek2
    Moderator Smart Home  
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    Do you have LN882H to investigate it with me? I will try to create a test PR soon.
    Helpful post? Buy me a coffee.
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  • #36 21446466
    divadiow
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    yeh sure
  • #37 21446468
    niterian
    Level 9  
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    >>21446370

    My LN882H consistently crashes on "Set Output High" on P13 on 1.18.42.
  • #38 21446503
    p.kaczmarek2
    Moderator Smart Home  
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    It crashes but only while setting to digital output, right? dInput and dInput without pull up works for me:
    User interface for managing GPIO signal settings.
    https://github.com/openshwprojects/OpenBK7231T_App/blob/main/src/hal/ln882h/hal_pins_ln882h.c
    Code: C / C++
    Log in, to see the code

    Maybe some pins don't like GPIO_HIGH_SPEED?
    https://github.com/search?q=repo%3Aopenshwprojects%2FOpenLN882H%20hal_gpio_init&type=code
    Code: C / C++
    Log in, to see the code
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  • #39 21446533
    insmod
    Level 31  
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    It's not that, gpios from A13 to B2 shouldn't be used at all, they are reserved(?) for QSPI, which i believe is internal flash.
    I, of course, could be wrong. But that is what i believe. There is also no FULLMUX for them.
  • #40 21446543
    p.kaczmarek2
    Moderator Smart Home  
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    I'm not sure. I'm confused at the moment. I've just flashed this LN882H bulb:
    https://www.elektroda.com/rtvforum/topic4107260.html
    and I am almost sure that I am unable to find the RGB pins, I have only CW working. And I really feel like I saw greenish tint for a moment while playing near P14 or P13, not sure.
    I will retry.

    Of course, taking out the board of this bulb could help to follow the traces, but I don't want to damage it.

    Added after 2 [minutes]:

    Checking right now ,starting from the end of the list., Crashed at P18:
    Screenshot showing ping command results in a console and pin settings in an application.
    Screenshot of the web interface with configuration options for LN882H bulb.
    Of course, the separate issue is that it's not really P18, those are Beken labels, they weren't changed for LN882H yet.

    Added after 2 [minutes]:

    Maybe I can try to use the photos I took...
    Close-up of a circuit board with a LIGHTNING LN882HK1 chip.
    Pin layout diagram of LN882HKx chip from Lightning Semiconductor.

    Added after 4 [minutes]:

    Update: I've found other PWM pins, so it seems that everything is ok except the fact that we need to disable those few pins in HAL so they don't crash
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  • #41 21446557
    insmod
    Level 31  
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    I feel like we need a separate check for gpio, something similar to HAL_PIN_CanThisPinBePWM, but if it can be input or output.
    Something like void HAL_PIN_CheckGPIODirs(int index, bool* input, bool* output)
  • #42 21446564
    p.kaczmarek2
    Moderator Smart Home  
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    It could be added with weak linking so we don't have to repeat each time for HAL.

    We also need to expose PWM names (or generic aliases) to Configure Module tab:
    Screenshot of OpenLN882H_C25E1088 pin configuration with PWM settings.
    And get correct names for the Web App:
    User interface for managing GPIO pins with various settings and values.
    For the Web App, I think we could get away with hardcoding those names in VUE files.... we don't really need to fetch them via API from OBK, or do we? Hardcoding them in Web Page may be less elegant but that is also lesser stress for WiFi module and it has no extra api requirement.
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  • #44 21447375
    divadiow
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    Seems like code changes needed before I have anything to try..
  • #45 21447718
    p.kaczmarek2
    Moderator Smart Home  
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    @insmod I saw PWM option missing from few pins and assumed that not all pins are PWM but now I see they are the QSPI pins we mentioned before....
    So basically we just can't set QSPI pins to outputs.
    At first I've been thinking about hiding Rel roles (and similar) from dropdown lists, but that's not perfect, we also set GPIO manually in many drivers...
    I've decided to go for the simplest fix now:
    https://github.com/openshwprojects/OpenBK7231...mmit/80111be27e34a3df00b532e6c64a6c08647e86fc
    If you can @divadiow, try it, I will also try in a moment. I also need to make sure I didn't disable too many pins by accident.

    Added after 24 [seconds]:

    PS: I ordered two more bulbs, let's see if I will get LN882H again?
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  • #46 21448676
    divadiow
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    p.kaczmarek2 wrote:
    If you can @divadiow, try it, I will also try in a moment

    I've gone through and set output to high on each and then cleared before moving onto the next. Nothing attached to any GPIO though. No crashes
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  • #47 21456136
    p.kaczmarek2
    Moderator Smart Home  
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    @divadiow I've checked what we spoke about and it seems the flash read was not present for Web App on LN882H, I will try to add it now:
    https://github.com/openshwprojects/OpenBK7231T_App/pull/1547

    Added after 5 [minutes]:

    I also figured out why it returned log content on unsupported platform - buffer has random garbage from ram that was there before alloc...

    Screenshot from GitHub showing a pull request about a code fix.
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  • #48 21456168
    divadiow
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    yes, that's better.

    I've read from offset 0x1D4000 and length 180224 bytes in the web app and compared the saved result to a fresh dump of the whole flash of the LN882H.
    it's almost the same so not sure why a little different. I'll wipe and start again to be sure

    Two hex panels with decoded text for binary files.

    the first offset difference when comparing:
    Comparison of two files with hexadecimal data and text.

    Added after 22 [minutes]:

    hmm. it's a bit weird. The second attempt was:

    -erase full Tuya flash from 0x0
    -do not boot
    -flash OBK to 0x0
    -boot OBK and dump from 0x1D4000 and length 180224 bytes

    compare 0x1D4000-0x2000000 from Tuya bin to extract = not identical. Assuming OBK is perhaps making changes in its boot between 0x1D4000-0x2000000 I next tried:

    -extract from 0x1EB000 (where it seem the Tuya config starts) for 86016 bytes and compare to the same range on original flash. Comparing looks OK at the beginning

    Screenshot of two opened binary files in a HEX editor.

    but then goes off the rails. the "test" and "1234abcd" is the AP it's connected to. Is something console/log still finding its way into the dump?
    Two program windows displaying binary data and text.

    Added after 1 [minutes]:

    files for own comparison
    Attachments:
    • compare.zip (7.42 KB) You must be logged in to download this attachment.
  • #49 21456215
    p.kaczmarek2
    Moderator Smart Home  
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    It should not if read works, but maybe it fails at some point. I can fill buffer with 0x00 just to be sure.

    Code snippet with version differences, showing changes in memory allocation and initialization.
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  • #51 21456320
    p.kaczmarek2
    Moderator Smart Home  
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    divadiow wrote:
    75246500_1740513401.png]Screenshot of two opened binary files in a HEX editor.[/url]

    but then goes off the rails. the "test" and "1234abcd" is the AP it's connected to. Is something console/log still finding its way into the dump?
    Two program windows displaying binary data and text.

    I've looked closer and hey, it's our OBK config! It's added by OBK on OBK start.
    Fragment of C source code with a configuration function.
    Source code snippet with macro definitions in C language.
    CFG (ascii text) is the ident of OBK config structure.

    So it seems everything is okay.
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  • #53 21511837
    rufus4
    Level 11  
    Posts: 65
    Rate: 8
    Hi, don't know where to post the best.

    I found this nice flasher. Everything is isolated from USB. So it might pretent failures based on different potencials.
    Isolation transformer DC/DC has got 200mA at 5V max. , and the Mosfet is rated with 300mA at 3.3V
    If this is still not enought it would be possible to remove the transformer and use a external powersource. Full isolation to USB will be still the same.
    (CA-IS3722HS dual-channel-isolator, B0505LS-1W dc-dc-converter, 662K voltage-regulator)

    [Youtube] LN882H module pinout and setup for flashing - step by step video guide
    https://www.aliexpress.com/item/1005007511243530.html
  • #54 21523289
    Ogurezzz
    Level 5  
    Posts: 10
    Rate: 2
    stefanmandl1 wrote:
    I wrote a flashing tool for Linux.

    https://github.com/mandl/LN882Loader


    It's perfect! My Windows 10 setup doesn't finish firmware dump. Error after several hundreds of bytes. Python version works perfect.
    Done Dump. Done flashing of fresh "OpenLN882H_1.18.85.bin"

    P.S. it will be nice to add more info and avaliable parameters to README.md of Loader.
  • #56 21564938
    divadiow
    Level 38  
    Posts: 4835
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    literally about to post here about your GH after seeing your mandl repo message.

    Command prompt window showing progress of Python script dumping LN882H flash memory.

    it still uses LN882H_CMD_Tool.exe though so it seems to be the same speed as before, but it's a much nicer progress output

    Added after 1 [minutes]:

    I didn't understand the connection to mandl's LN882Loader though because that doesn't use the exe and is all ymodem?
  • #57 21564993
    spleefer90
    Level 7  
    Posts: 17
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    Rate: 5
    > I didn't understand the connection to mandl's LN882Loader though

    It's the same chip, it would be nicer for the repos to be crosslinked for discoverability.
  • #58 21565095
    divadiow
    Level 38  
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    yep yep, sure. anyway, thanks for making/sharing.
  • #59 21572595
    divadiow
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    >>20963801

    https://airtake-public-data-1254153901.cos.ap...loud.com/smart/embed/pruduct/ln882h_0.0.1.zip
    https://airtake-public-data-1254153901.cos.ap...loud.com/smart/embed/pruduct/ln882h_0.0.2.zip
    https://airtake-public-data-1254153901.cos.ap...loud.com/smart/embed/pruduct/ln882h_0.0.3.zip
    https://airtake-public-data-1254153901.cos.ap...oud.com/smart/embed/pruduct/ln882h_0.0.11.zip

    0.0.11 looks to have been released just recently. not much left with toolchain removed
    Attachments:
    • ln882h_0.0.11.zip (3.14 MB) You must be logged in to download this attachment.
  • #60 21579857
    @GUTEK@
    Level 31  
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    Board Language: polish
    Hello,
    Are there any settings in OpenBeken for the Wifi connection apart from the ability to enable Power Save?
    Recently purchased cheap mini switches from Ali turned out to be built on an LN-02 module, LN882HKI chip. And unfortunately at a colleague's place they notoriously disconnect from the network. I don't see anything unusual in the router settings, and interestingly the same version of OpenBeken uploaded in NK7231N doesn't disconnect.
    I know the logs could tell something, but he doesn't solder to the rx/tx.
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Topic summary

✨ The discussion centers on flashing the LN882H (specifically LN882HKI) module using open-source tools and firmware such as OpenBeken and OpenBK7231T_App, with detailed guides and video tutorials available. Flashing involves grounding the BOOT pin and using UART communication, which employs ASCII commands and the YMODEM protocol for data transfer. Several tools have been developed and shared, including LN882Loader (Linux-based) and Windows GUI wrappers, with ongoing improvements to support faster flash reading and dumping via commands like "fdump." Users report challenges with UART adapters, power supply stability, and correct COM port usage, highlighting the importance of proper hardware setup (e.g., CH340G vs. FTDI232 UART adapters). SSDP support and Home Assistant integration are discussed, with SSDP requiring IGMP flag enabling and driver activation in firmware. GPIO pin behavior and limitations are examined, noting that certain pins (A13 to B2) are reserved for QSPI flash and should not be used as GPIO outputs. Firmware versions and SDK updates are tracked, with reverse engineering efforts revealing internal flash structures and configuration data. WiFi stability issues on LN882H modules are reported, potentially linked to power supply quality or environmental factors, distinct from BK7231N platform behavior. Pinout details for LN882HK1 modules are clarified, identifying UART TX and RX pins and the BOOT pin for flashing mode entry. Overall, the community collaborates on improving flashing tools, firmware features, and hardware understanding to enable cloud-free operation and integration with smart home systems.
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FAQ

TL;DR: Backing up 2MB from LN882H went from about 14 minutes to 12.5–24.8 seconds, and one tester confirmed, "SmartLife AP seen and pairs in Tuya app." This FAQ is for people flashing LN882H/LN882HKI modules with OpenBeken, restoring Tuya backups, and fixing UART, Wi‑Fi, GPIO, and SSDP issues. [#21609499]

Why it matters: LN882H devices often look simple to flash, but real success depends on correct boot wiring, stable 3.3V power, the right RAM loader, and avoiding reserved GPIOs.

Tool Best use OS Read/backup speed reported Notes
SharpLN882HTool Flash, erase, backup, restore Windows 24.77s at 921600; 47.52s at 460800 Later builds restored full Tuya dumps successfully
LN882Loader Linux flashing and backup Linux Earlier full 2MB dumps around 10–14 min Reverse-engineered, YMODEM-based
Tuya flasher / tyutool_cli Vendor flashing Windows / Linux extraction Read not supported in tyutool_cli One user saw: "Don't support read."

Key insight: The biggest breakthrough was not the firmware itself but the RAMCODE path: once the custom dumper switched to raw binary reads with CRC and stable UART polling, LN882H backup and restore became fast enough to be practical for everyday recovery and migration. [#21608266]

Quick Facts

  • Full-flash backup size is 2MB, and one successful custom dumper run finished in 12.5 seconds at 921600 baud after RAMCODE improvements. [#21608190]
  • Earlier dump methods were much slower: 2MB in ~14 min 20 s with LN882H_RAM_BIN.bin, and about 9 min 50 s after changing baud and stub choices. [#21605883]
  • A validated speed comparison for SharpLN882HTool v22 showed 184.05 s at 115200, 47.52 s at 460800, and 24.77 s at 921600, with identical SHA-256 hashes across those dumps. [#21609499]
  • Safe UART access points identified on a bare LN882HK1-on-PCB board were A2 = TX0, A3 = RX0, A9 = pull low for UART download mode, and B9 = TX1 boot log, often at 921600 baud. [#21593199]
  • One reproducible GPIO failure on LN882H was P13 crashing on “Set Output High” in firmware 1.18.42, later linked to flash/QSPI-reserved pins that should not be driven as normal outputs. [#21446468]

1. How do I flash an LN882H or LN882HKI module with OpenBeken step by step using UART and the BOOT pin?

You flash LN882H over UART by grounding one BOOT pin, powering the board at 3.3V, and sending a RAM loader before the firmware. 1. Solder GND, 3.3V, TX, RX, and the BOOT pin. 2. Hold BOOT low, power up, then connect with a flasher tool. 3. Upload the RAM loader, then write OpenBeken to flash at 0x0. The original guide says LN882H flashing is “very similiar to ESP8266,” with BOOT grounded to enter flashing mode. [#21372895]

2. Where are TX, RX, and boot-mode pins on an LN882HK1 chip mounted directly on the PCB, and how do I identify them safely?

On one directly mounted LN882HK1 board, the reported pins were A2 for TX0, A3 for RX0, A9 for boot-mode entry, and B9 for TX1 boot logs. Safest identification uses labeled pads, board photos, and UART observation before soldering to tiny chip legs. 1. Find GND, 3.3V, and EN first. 2. Check nearby pads against known LN882H pin maps. 3. Confirm with a logic analyzer or boot log on B9 before forcing boot mode. [#21593199]

3. Why does LN882H flashing fail with a USB-to-UART adapter even when it has a 3.3V output, and how can I troubleshoot power and COM port issues?

LN882H flashing often fails because the adapter is not actually transmitting, the COM port is wrong or busy, or the 3.3V rail is unstable under load. One user fixed repeated failures by replacing a faulty FTDI232 adapter with a CH340G unit; another was told to verify COM6 and check for port-hogging software like Cura. A separate report also found that an AMS1117-based 3.3V source improved flashing stability. [#21443865]

4. What is YMODEM, and how is it used by LN882H flashing tools and RAM loaders?

“YMODEM” is a serial file-transfer protocol that sends block-based data with acknowledgements and CRC checks, enabling reliable firmware or RAM loader transfer over UART. LN882H tools use YMODEM to upload the temporary RAM loader first, then often use it again to write the actual firmware image. Reverse-engineering in the thread identified YMODEM as the protocol behind the loader flow, and later tool logs showed ACK, EOT, CRC, and packet counters exactly matching that process. [#21376683]

5. What is SSDP discovery, and why did Alexa or Wemo emulation not work on LN882H until SSDP support was enabled?

Alexa and Wemo emulation did not work because LN882H lacked SSDP support in earlier builds. “SSDP discovery” is a local-network service discovery protocol that advertises devices over multicast, letting controllers like Alexa find compatible endpoints automatically. In the thread, Wemo emulation showed up in setup.xml, but Alexa still could not discover it until SSDP and the related networking support were enabled on LN882H. A later post said SSDP had been enabled the previous week. [#21430384]

6. LN882Loader vs SharpLN882HTool vs Tuya's LN882H flasher — which tool is best for flashing, backup, and restore on Windows or Linux?

SharpLN882HTool became the best all-around choice for Windows once fast dump, erase, and restore worked; LN882Loader stayed strong for Linux; Tuya’s tools were useful for reference but weaker for backup. A tester confirmed SharpLN882HTool erased flash, wrote OpenLN882H, restored a full Tuya dump, and then saw the “SmartLife AP” pair in the Tuya app. Another user also reported tyutool_cli could communicate with the chip but ended with “Don't support read.” [#21609499]

7. Why is dumping LN882H flash so slow with flash_read or fdump, and how did the custom RAMCODE speed it up?

The old dump path was slow because it read tiny chunks as ASCII hex over UART instead of sending raw bytes. One developer explained that flash_otp_read 0x0 0x100 returned text like AE BE 4F 2D 5A, meaning roughly 3 characters per stored byte. The custom RAMCODE changed the method to raw binary blocks plus CRC, which removed the ASCII overhead and made full 2MB reads practical in seconds instead of minutes. [#21607145]

8. How can I back up the full 2MB flash from an LN882H module and restore that backup later without losing Tuya or OpenBeken data?

You can back up the full 2MB flash, erase the chip, and later restore that exact image to recover Tuya or OpenBeken. 1. Use a tool that reads the full 0x200000 flash range to a file. 2. Save that dump before experimenting. 3. If needed, erase flash and write the saved file back at 0x0. A tester erased an LN882H, reflashed a Tuya dump with SharpLN882HTool, and confirmed the SmartLife AP appeared and paired in the Tuya app. [#21609499]

9. Which LN882H GPIOs are unsafe to drive as outputs, and why do some pins cause WDT resets or crashes in GPIO Doctor?

Some LN882H pins mapped to the internal flash/QSPI area are unsafe as normal outputs and can trigger crashes or WDT resets. One contributor stated that pins from A13 to B2 should not be used because they are reserved for QSPI, likely internal flash. Real testing also showed repeatable crashes, including P13 on “Set Output High” in version 1.18.42, and later fixes focused on disabling those dangerous pins in HAL. [#21446533]

10. How do I use GPIO Doctor or manual testing to find the relay, button, LED, and PWM pins on an unknown LN882H device?

Use GPIO Doctor carefully, starting with inputs and low-risk checks, then test outputs one at a time while watching for crashes. 1. Back up flash first. 2. Probe candidate pins as digital input or input-pullup before driving outputs. 3. Map relay, LED, button, and PWM by changing one pin at a time and noting physical responses. This matters on LN882H because some pins can crash the device, yet the same method still helped users identify working relay and PWM pins on unknown boards. [#21446543]

11. What Wi-Fi settings are actually available in OpenBeken for LN882H besides Power Save, and what else can cause random disconnects on one network but not another?

Beyond Power Save, the thread only names Quick Connect as another practical LN882H Wi‑Fi option in OpenBeken. A developer added that Wi‑Fi behavior mainly comes from the LN882H SDK, not shared OBK code, so stability can change by platform. In the reported disconnect case, likely causes included local RF noise, supply quality, MQTT load, and possibly flash state or calibration, especially because the same device stayed stable for 3 days on a different network. [#21579867]

12. Why did WPA3 or WPA2/WPA3 connections fail on older LN882H SDK builds, and what changed in the newer Wi-Fi library versions?

Older LN882H builds failed on WPA3 because the Wi‑Fi library rejected association, including repeated reason code 43 errors. That changed after the SDK moved to newer Wi‑Fi libraries, including WiFi Lib 1.5.0, where one tester successfully joined a WPA‑SAE (CCMP) access point and verified fast reconnection after the AP returned. The same tester also said WPA2-only and mixed WPA2/WPA3 then behaved correctly. [#21615134]

13. How does the faster custom LN882H RAM dumper work, including baud rate, CRC checks, and polling vs interrupt-based UART TX?

The faster dumper uploads a custom RAMCODE, reads flash in fixed binary blocks, appends a 2-byte CRC16 to each block, and transmits over a high UART baud rate. One implementation used 512-byte flash blocks plus CRC and achieved stable dumps at 921600 baud after switching UART TX from interrupt mode to polling mode. The author said polling was not faster by itself, but it was more stable and fixed CRC failures seen at higher baud rates. [#21610067]

14. What does LN882H RAMCODE do during flashing, and how is it different from the normal bootloader or secondary boot stage?

RAMCODE is a temporary program sent over UART into RAM so the chip can erase, write, dump, and inspect flash using richer commands than the ROM alone provides. “RAMCODE” is a RAM-resident helper program that runs after UART boot, adds flash commands, and then hands control back or resets after the task finishes. The SDK description in the thread distinguishes it from the normal bootload stage, which is the secondary boot path from flash to app during standard startup. [#21605903]

15. How can I build a custom OpenBeken OTA firmware for LN882H with extra drivers like SHT3X enabled, either locally or through GitHub Actions?

You can build it locally or through GitHub Actions by enabling the driver macro for LN882H. The thread’s build steps say to add #define ENABLE_DRIVER_SHT3X 1 under #elif PLATFORM_LN882H in src/obk_config.h, then run make OpenLN882H locally. If you do not have the toolchain, fork the repository, enable Actions on the fork, commit the config change, and download the finished firmware artifact from the workflow summary. [#21709798]
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