logo elektroda
logo elektroda
X
logo elektroda
Advanced Search
logo elektroda

[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.
Generated by the language model.
ADVERTISEMENT
Report a violation of the law
Reply Cool? Ranking DIY | New topic
Notify about new articles
📢 Listen (AI):
  • #61 21579867
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14390
    Help: 650
    Rate: 12313
    WiFi is the responsibility of a platform's SDK, so stable WiFi on the BK7231N has nothing to do with WiFi on the LN882H. The OBK only offers common application code, which then separately builds on each MCU's SDK.

    WiFi could potentially be affected by PowerSave, although I have not encountered a situation where it has caused harm. Additionally, there's a Quick Connect flag (recommended - unless there's a connection problem just after a reboot), and that's probably all the options available.

    Additionally, a potential source of problems could be doing a full erase flash before flashing the OBK - because the OBK only overwrites the applications, it doesn't remove the RF calibration section on the BK7231. I don't know about the LN882H, it's a fairly unknown platform and not a lot of testing has been done there.

    WiFi stability could also be affected by the power supply, maybe add a 100nF capacitor or something.

    Also a question, do these LN882H's only have problems at a colleague's site, or on any network? Noise in the ether matters a lot, neighbours' networks etc.

    Another thing - do they get disconnected from WiFi, or do they reboot completely? What does their uptime look like there? Is MQTT enabled?
    Helpful post? Buy me a coffee.
  • ADVERTISEMENT
  • #62 21579876
    @GUTEK@
    Level 31  
    Posts: 1559
    Help: 163
    Rate: 367
    Board Language: polish
    I uploaded OpenBK with this GUI flasher, I don't know if it deletes any calibrations.
    Tried without PowerSave and 1 and 2, no change.

    With the capacitor it could also be a clue, as he has a PV and I wonder if his inverter is sowing something. He lives in the mountains, so I wouldn't suspect a big siphon in the ether.
    The problem is only with a colleague, at my place I had one LN882H connected to WiFi and MQTT and for 3 days nothing happened - also with PowerSave on, it worked perfectly.

    They only disconnect from WiFi, they don't reboot. Uptime doesn't matter, it could be 2 minutes after switching on, or it could suddenly start working and only disconnect after 2 hours. There is no rule. MQTT connected to Mosqiutto in addition to HA.
  • #64 21581324
    @GUTEK@
    Level 31  
    Posts: 1559
    Help: 163
    Rate: 367
    Board Language: polish
    It is difficult to talk about any kind of overload when the device, as soon as it is switched on, with the relay switched off, is able to break the connection.

    There is something strange going on there at all. For example, the BK7231N with PowerSave 1 switched on reaches 70C, with RSSI: -60dBm. Only that it doesn't lose connection.This is a mini switch lying on a desk, at my place the same one stuck in a box under the switch, i.e. without ventilation, is 52C.

    I have also noticed that on 1.18.110 the web interface works much worse than, say, 1.18.11.
    It can stop responding and after switching on you have to wait a while for it to start working, even though the device is already connected to WiFi.
  • #65 21581333
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14390
    Help: 650
    Rate: 12313
    @GUTEK@ wrote:
    .
    I also noticed that on 1.18.110 the web interface works much worse than, for example, 1.18.11.

    On which platform? With what can you narrow down more where things went wrong?
    Helpful post? Buy me a coffee.
  • #66 21593114
    blacksun2
    Level 8  
    Posts: 59
    Rate: 1
    Hello,

    I bought the same smart switch as in the YouTube video. However, the LN882HK1 is mounted directly on the circuit board.
    GND, 3.3V, and EN are present and labeled as contact points. But where are Tx and Rx?


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

    Big thanks.
  • ADVERTISEMENT
  • #68 21605288
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14390
    Help: 650
    Rate: 12313
    @divadiow what is the state of this tool by @stefanmandl1 https://github.com/mandl/LN882Loader ? According to readme on Github, it can both flash and read the firmware. Is it functional?
    Helpful post? Buy me a coffee.
  • #69 21605639
    divadiow
    Level 38  
    Posts: 4835
    Help: 420
    Rate: 851
    p.kaczmarek2 wrote:
    Is it functional?

    Yes, last time I checked it was working. Flash backup was much quicker than py/exe CMD line tool but still took maybe 10+ mins. Home in a couple of hours so can confirm behaviour and time soon.

    Added after 4 [minutes]:

    divadiow wrote:
    fdump address range expanded to cover 2mb. It takes approximately 14 minutes to dump 2mb, despite self.ser.baudrate = 115200 being set. Any higher and the script errors with:


    Added after 3 [hours] 58 [minutes]:

    https://github.com/mandl/LN882Loader flashes fine. stub required like RTL. Script doesn't do backup as-is but here is my thing from months ago that does do dump. I have it running now with timer.

    https://www.elektroda.com/rtvforum/topic4096854.html#21381159
    Attachments:
    • dumper.zip (2.17 KB) You must be logged in to download this attachment.
  • #70 21605883
    divadiow
    Level 38  
    Posts: 4835
    Help: 420
    Rate: 851
    I wonder if the other stubs will allow faster dumping in the place of LN882H_RAM_BIN.bin
    [Youtube] LN882H module pinout and setup for flashing - step by step video guide

    maybe @stefanmandl1 already looked into those

    Added after 4 [minutes]:

    divadiow wrote:
    OK, so with the attached, which contains h.changeBaudrate(921600), the speed is still not 921600, but the 2mb was finished at ~9 mins 50s

    so baud rate change looks to have made a difference but dumps seems not to really be 921600. I'll try the other stubs

    Added after 8 [minutes]:

    h.changeBaudrate(115200) / LN882H_RAM_BIN.bin = 14minutes 20s to dump 2mb flash
  • ADVERTISEMENT
  • #71 21605898
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14390
    Help: 650
    Rate: 12313
    Where do these come from? Github? Gitee? Maybe a search could give some info?
    Helpful post? Buy me a coffee.
  • #72 21605903
    divadiow
    Level 38  
    Posts: 4835
    Help: 420
    Rate: 851
    they're bundled in with various flashers
    [Youtube] LN882H module pinout and setup for flashing - step by step video guide

    LN882Loader repo already appears to use the larger stub, though its code isn't identical to the 3 above

    Added after 23 [minutes]:

    ah, so the 9 minute 2mb dump is if you use stub LN882H_RAM_ADVANCE_BIN.bin

    Added after 1 [minutes]:

    Code: Text
    Log in, to see the code


    trying higher but it doesn't seem to faster

    Added after 36 [minutes]:

    wait. The Tuya SDKs for LN882H contains source for bootloader and ramcode?

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

    Code: Text
    Log in, to see the code
  • #73 21606559
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14390
    Help: 650
    Rate: 12313
    Ok, I ported the basic handshake, but I don't have LN882H at the moment. Can you give it a go?
    https://github.com/openshwprojects/SharpLN882HTool
    Helpful post? Buy me a coffee.
  • #74 21606637
    divadiow
    Level 38  
    Posts: 4835
    Help: 420
    Rate: 851
    v5
    Code: Text
    Log in, to see the code


    sat waiting for ACK at the moment

    Added after 16 [minutes]:

    lmk if you want video of whole ln882loader stock flasher and or dumper experience in ubuntu terminal
  • ADVERTISEMENT
  • #75 21606658
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14390
    Help: 650
    Rate: 12313
    Try V6. It will dump packet. If still not ACK, then open YModem.py and add this:
    [Youtube] LN882H module pinout and setup for flashing - step by step video guide
    Code: text Expand Select all Copy to clipboard
    
        print("SEND PACKET:", ' '.join(f'{b:02X}' for b in data_for_send))


    Added after 1 [minutes]:

    I have a mistake in packet header and comparing bytes may help
    Helpful post? Buy me a coffee.
  • #76 21606676
    divadiow
    Level 38  
    Posts: 4835
    Help: 420
    Rate: 851
    v6 original
    Code: Text
    Log in, to see the code


    ymodem.py is not part of the project code though?
  • #77 21606677
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14390
    Help: 650
    Rate: 12313
    ymodem.py is the code I base on:
    https://github.com/mandl/LN882Loader
    Helpful post? Buy me a coffee.
  • #78 21606689
    divadiow
    Level 38  
    Posts: 4835
    Help: 420
    Rate: 851
    Code: Text
    Log in, to see the code
  • #79 21606692
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14390
    Help: 650
    Rate: 12313
    Oh no, so the CRC is bad?

    Code: text Expand Select all Copy to clipboard
    01 00 FF 4C 4E 38 38 32 48 5F 52 41 4D 5F 42 49 4E 2E 62 69 6E 00 33 37 38 37 32 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 A6 E8


    Code: text Expand Select all Copy to clipboard
    01 00 FF 4C 4E 38 38 32 48 5F 52 41 4D 5F 42 49 4E 2E 62 69 6E 00 33 37 38 37 32 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 99 E5


    Added after 5 [minutes]:

    Wait, CRC functions are ok. Do I calculate CRC for a correct bytes range?
    [Youtube] LN882H module pinout and setup for flashing - step by step video guide
    Helpful post? Buy me a coffee.
  • #80 21606838
    divadiow
    Level 38  
    Posts: 4835
    Help: 420
    Rate: 851
    Rhetorical question? I don't know the answer. What can I do?

    Added after 7 [minutes]:

    ymodem.h
    Code: C / C++
    Log in, to see the code
  • #81 21606857
    divadiow
    Level 38  
    Posts: 4835
    Help: 420
    Rate: 851
    ymodem.c
    Code: Text
    Log in, to see the code


    Added after 59 [seconds]:

    in cmd_mode.h
    Code: Text
    Log in, to see the code
  • #82 21606890
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14390
    Help: 650
    Rate: 12313
    Ah... I see, ok retry. Check the upcoming build?
    Helpful post? Buy me a coffee.
  • #83 21606898
    divadiow
    Level 38  
    Posts: 4835
    Help: 420
    Rate: 851
    Code: Text
    Log in, to see the code



    etc etc etc
  • #84 21606900
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14390
    Help: 650
    Rate: 12313
    ah i forgot to turn off the debug messages, but it seems to go futher
    Helpful post? Buy me a coffee.
  • #85 21606902
    divadiow
    Level 38  
    Posts: 4835
    Help: 420
    Rate: 851
    sdk files for ref
    Attachments:
    • ln882h_bootcode.zip (54.1 KB) You must be logged in to download this attachment.
  • #86 21606907
    divadiow
    Level 38  
    Posts: 4835
    Help: 420
    Rate: 851
    v8
    Code: Text
    Log in, to see the code
  • #87 21606943
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14390
    Help: 650
    Rate: 12313
    Nice, next step, but I didn't even manage to check this.
    Code: text Expand Select all Copy to clipboard
    
            // Erase: SharpLN882HTool.exe -p COM3 -ef
            // Read: SharpLN882HTool.exe -p COM3 -rf 0x200000 dump.bin
            // Write: SharpLN882HTool.exe -p COM3 -wf obk.bin
    Helpful post? Buy me a coffee.
  • #88 21606950
    divadiow
    Level 38  
    Posts: 4835
    Help: 420
    Rate: 851
    v8
    Code: Text
    Log in, to see the code


    flash was not erased. previous OBK booted up after power cycle

    Code: Text
    Log in, to see the code


    it's not getting to the next bits after stub

    Added after 1 [minutes]:

    write file with no obk.bin present doesn't error

    Code: Text
    Log in, to see the code


    Added after 1 [minutes]:

    would be interesting to know what this is doing for such a quick erase. hmm
    gif

    [Youtube] LN882H module pinout and setup for flashing - step by step video guide
  • #89 21606959
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14390
    Help: 650
    Rate: 12313
    Oops, it seems I can do only one command after RAM code is uploaded, that's why futher commands failed. Update and retry.

    Added after 1 [minutes]:

    Flash erase just sends command to loader:
    Code: C#
    Log in, to see the code
    Helpful post? Buy me a coffee.
  • #90 21606965
    divadiow
    Level 38  
    Posts: 4835
    Help: 420
    Rate: 851
    v10
    Code: Text
    Log in, to see the code


    i'll move onto v11

    Added after 1 [minutes]:

    v11
    Code: Text
    Log in, to see the code


    Added after 1 [minutes]:

    Code: Text
    Log in, to see the code


    Added after 2 [minutes]:

    Code: Text
    Log in, to see the code


    Added after 28 [minutes]:

    v12
    Code: Text
    Log in, to see the code


    Code: Text
    Log in, to see the code


    Code: Text
    Log in, to see the code
Reply Cool? Ranking DIY | New topic
Notify about new articles
📢 Listen (AI):
Report a violation of the law

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.
Generated by the language model.
Today's popular

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]
Generated by the language model.
ADVERTISEMENT