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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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  • #151 21609102
    insmod
    Level 31  
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    >>21609082
    I changed it, because it dumps everything. And flash size is read just before dumping.

    Read everything into memorystream and then return specified offset?
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  • #152 21609114
    divadiow
    Level 38  
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    p.kaczmarek2 wrote:
    We still probably need a "read at offset"

    I must admit, read from and write to specific offsets and custom lengths is often useful, though not a priority or a problem if not an option.
  • #153 21609140
    insmod
    Level 31  
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    Just now got a terminal version working.
    fdump doesn't work there though
    Code: text Expand Select all Copy to clipboard
    Opening port COM6...
Port COM6 open!
upload_ram_loader will upload ramcode_ln882h.bin!
Sync with LN882H... wait 5 seconds
send version... wait for:  Mar 14 2021/00:23:32
Mar 14 2021/00:23:32
Connect to bootloader...
Will send file via YModem
YModem::send: v2 will wait for CRC...
YModem::send: v2 wait_for_next CRC ok!
YModem::send: first packet 01 00 FF 72 61 6D 63 6F 64 65 5F 6C 6E 38 38 32 68 2E 62 69 6E 00 31 35 30 30 38 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 79 7A
YModem::send: v2 will wait for ACK...
YModem::send: v2 wait_for_next ACK ok!
YModem::send: v2 will wait for second CRC...
YModem::send: v2 wait_for_next second CRC ok!
Sending at 0... Sending at 1024... Sending at 2048... Sending at 3072... Sending at 4096... Sending at 5120... Sending at 6144... Sending at 7168... Sending at 8192... Sending at 9216... Sending at 10240... Sending at 11264... Sending at 12288... Sending at 13312... Sending at 14336... Sending at 15008... Done!
YModem::send: sending loop done!
Start program. Wait 5 seconds
send version... wait for:  RAMCODE
version
RAMCODE
flash uid:0x433032313333342E3030230050009AFF
Give command: version
version
RAMCODE

[Timeout waiting for device reply]
Give command: version
version
RAMCODE

[Timeout waiting for device reply]
Give command: fdump 0x0 0x1000
fdump 0x0 0x1000
pppp

[Timeout waiting for device reply]
Give command: fdump 0x0 0x100
fdump 0x0 0x100
pppp

[Timeout waiting for device reply]
Give command:
  • #154 21609499
    divadiow
    Level 38  
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    v22
    Dumps
    115200 - 184.0506484s
    460800 - 47.5169445s
    921600 - 24.772409s
    1500000 - 184.050883s

    Code: Text
    Log in, to see the code


    had to keep A9 low now because post-dump reset would bring up AP and a few bytes would change in between dumps
    brb the rest of tests

    Added after 3 [hours] 4 [minutes]:

    erase
    Code: Text
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    [Youtube] LN882H module pinout and setup for flashing - step by step video guide

    write to blank (write fixed at 921600?)
    Code: Text
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    OpenLN AP comes up as normal

    Added after 8 [minutes]:

    flash of Tuya backup to erased flash

    Code: Text
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    SmartLife AP seen and pairs in Tuya app.
  • #155 21609680
    insmod
    Level 31  
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    I managed to create a terminal version with fast dumping, but changing the baudrate in code doesn't work for some reason. If changed manually in terminal, it works fine.
    Binary attached. Protocol is the same, 512 bytes of flash + 2 bytes crc.
    fdump [addr] [size]
    Delay before read output is about 2 seconds
    Writing/erase should work as well.
    https://github.com/NonPIayerCharacter/OpenLN882H/tree/_ramcode
    Attachments:
    • ramcode_ln882h.bin (14.93 KB) You must be logged in to download this attachment.
  • #156 21610045
    p.kaczmarek2
    Moderator Smart Home  
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    I see you changed ISR to polling, is polling faster in this case?
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  • #157 21610067
    insmod
    Level 31  
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    >>21610045
    Not faster, but more stable at higher baud rates.
    Remember how i complained about crc errors at 921600 and higher? This fixed that.

    Added after 2 [hours] 15 [minutes]:

    Surprisingly, merge with latest commit was very easy, only 2 conflicts (one of them was because of static ip change, another is translation).
    Attachments:
    • dev_20250718_122220.rar (874.91 KB) You must be logged in to download this attachment.
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  • #158 21610212
    divadiow
    Level 38  
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    insmod wrote:
    Surprisingly, merge with latest commit was very easy, only 2 conflicts (one of them was because of static ip change, another is translation).

    amaze.
    I wonder if this will make any diff to these reports of wifi issues.
  • #159 21610252
    p.kaczmarek2
    Moderator Smart Home  
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    What did they change with SDK update?
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  • #161 21610273
    insmod
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    [postid:7bfc69fcbe][/postid:7bfc69fcbe]
    Nothing really major. We had v2.1_rc1, this one is v2.1_rc5.
    Wifi libs update, pvPortRealloc, pwm demo update (perhaps it will be possible to use original driver, instead of my reimplementation) etc.
    Plus i enabled -Os, so binary should be lighter.

    In v2.1_rc2 "Enhance the robustness of WiFi retransmission in extreme interference environment"

    It still need to be tested. Or if it even boots. I enabled test commands in https://github.com/openshwprojects/OpenBK7231T_App/pull/1724
  • #163 21610275
    insmod
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    [postid:f4387a6116][/postid:f4387a6116]
    We don't "have" ADC in OBK.
    In code, we use ADC channel 0. The one used for internal temperature and wifi calibration. For everything.

    Added after 12 [minutes]:

    It boots. Version is 1724_merge_a7d75940edc4
    All tests are successful.
    I remember there was a problem with long startup command? I wonder if it fixed now.
  • #164 21610914
    divadiow
    Level 38  
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    insmod wrote:
    I remember there was a problem with long startup command? I wonder if it fixed now

    Vaguely rings a bell but I may be thinking of most recent experience with long DS18B20 full driver startup command before @max4elektroda revised to make shorter. I will check maximum length when home
  • #165 21612107
    p.kaczmarek2
    Moderator Smart Home  
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    Ok, is that Ln882H PR tested and ready?

    Also, I am preparing for release of our LN882H util, so I can move to adding it to Easy Flasher, but I have one question - @insmod how did you find out which offset has baud rate at the build RAM code? Did you just search for constant in bin code, did you decompile it with Ghidra, or is Keil creating some kind of link/debug file?
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  • #166 21612112
    insmod
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    >>21612107
    It was a self-compiled binary.
    I then simply recompiled it with a different baud rate and then ran compare in hex editor.

    No tests on PR were run, other that it simply boots and connects to wifi.

    Binary in https://www.elektroda.com/rtvforum/topic4096854-150.html#21609680 is different, it uses a normal terminal interface, but adapted to dump raw. Meaning it can dump at offset, variable baud rate, read and write without reset etc.
    But, i encountered a problem with changing baud rate in tool. Tool hanged. If baud rate is changed in terminal, it worked fine.
  • #168 21612221
    p.kaczmarek2
    Moderator Smart Home  
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    Well, as long as OTA still works, we can still fix any potential problems if they arise...

    LN882H new flash tool summary (with great flash read by @insmod) drops tomorrow, and I will start integration with Easy Flasher later.
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  • #169 21612226
    divadiow
    Level 38  
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    awesome. yes. I am flashing back and forth between general release and PR

    Code: Text
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  • #170 21612759
    p.kaczmarek2
    Moderator Smart Home  
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    Progress update, report, and new discussion topic - for clarity...
    https://www.elektroda.com/rtvforum/topic4131077.html
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  • #171 21614194
    divadiow
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    Code: Text
    Log in, to see the code

    The big 1.18.122 release is where LN882H AP mode after flashing does this;

    Code: Text
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    it stops when you join AP but then device reboots. Subsequent AP is fine and you can configure as normal to STA

    Added after 2 [minutes]:

    it is not seen in the newer SDK PR

    Code: Text
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    Added after 8 [hours] 42 [minutes]:


    sadly no change to LN882H WPA3 connectivity with SDK/wifi libs update

    Code: Text
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    Added after 4 [hours] 8 [minutes]:

    [postid:247c78e621][/postid:247c78e621]
    https://gitee.com/lightningsemi/ln882h/commit/a813e6bc9577052993603b3f97c5dc971e1f3669
    Code: Text
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  • #172 21615030
    insmod
    Level 31  
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    Check WPA3 with latest update (and will wpa2 continue to work)
    And if it reconnects without problems
  • #173 21615134
    divadiow
    Level 38  
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    ok. firstly, initial boot:

    Code: Text
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    Success joining WPA-SAE (CCMP) AP
    Code: Text
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    When AP is disabled, disconnecting OpenLN, LN constantly scans and displays all nearby APs over and over. Upon AP re-enable it connects again very quickly.

    Network UI showing connection details to AP OBK3 by device LN882H_STA.lan

    In WPA2-only and then in WPA2/WPA3 the behaviour is the same for successful connection and then scanning and re-connect after AP disappears.

    Feels like a big success.
  • #174 21709638
    sergiopoverony
    Level 5  
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    Hi everyone, can anyone build an OTA firmware LN882H with SHT31X driver support?
  • #175 21709798
    max4elektroda
    Level 24  
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    There are several ways to answer your question with: "Yes, you" ;-)

    If you have all development requiremnts on your PC, you only need to clone the repository,
    Then change "src/obk_config.h" to contain
    "#define ENABLE_DRIVER_SHT3X 1"
    under
    "#elif PLATFORM_LN882H"

    "make OpenLN882H" will then build it.


    If you don't have the needed environment, but a git account, you, can "build it online", if not, you can after you made an account ;-)
    The simplest way is to do it as laid out here:
    https://www.elektroda.com/rtvforum/topic4082682.html#21275413
    In the lower part after it shows an easy way to do "online Builds" in your own repository - no need for an PR in the OpenBeken repository.

    Fork the git and make your own branch
    Make sure, on "Action" tab, you allow workflows:
    Assuming this is your first approach, you will need to activate "workflows" once:
    So open "your" fork and as the very first step go to the "Actions" tab.
    If you read: "Workflows aren’t being run on this forked repository":
    Allow workflows with the button "I understand my workflows, go ahead and enable them".

    In your branch, as above, change "obk_config.h" to contain
    "#define ENABLE_DRIVER_SHT3X 1"
    under
    "#elif PLATFORM_LN882H"

    and commit the change.

    Under Actions tab wait until LN882H is built, then go to "summary" and download the firmware.


    Or, even simpler, let someone do it for you and take the firmware attached ;-)
    Attachments:
    • OpenBK7231T_App_SHT_LN882H_e0965d9fb27c_OpenLN882H.zip (967.91 KB) You must be logged in to download this attachment.
  • #176 21709801
    sergiopoverony
    Level 5  
    Posts: 3
    Rate: 1
    sergiopoverony wrote:
    Hi everyone, can anyone build an OTA firmware LN882H with SHT31X driver support?

    Thanks, I'm still learning the auto-assembly system and I don't understand anything yet.
  • #177 21810978
    xakercdcom
    Level 3  
    Posts: 3
    Hi, I flashed your firmware, but the relay isn't working. It only works through Cozylife; I wanted it to work through Tuya
    Spoiler:
    Close-up of PCB with capacitors, relay, and LNB82FKL microchip Disassembled mini Wi-Fi smart switch with visible PCB on fabric background. Yuthon relay module with green terminals and opened white casing Disassembled mini smart WiFi switch with visible PCB and casing parts Printed circuit board with capacitors, microchip, and fine wires for measurement. Close-up of a green PCB with tracks, solder points, and connected wires.
    Attachments:
    • readResult_LN882H_1_2026-16-1-21-18-13.bin (2 MB) You must be logged in to download this attachment.
  • #179 21811076
    xakercdcom
    Level 3  
    Posts: 3
    >>21811035
    P1 (RXD2)
    Rel
    Ch:
    62

    It's the relay itself. I didn't have time to check the buttons and LED; it accidentally shorted out and ruined the controller.
  • #180 21811084
    p.kaczmarek2
    Moderator Smart Home  
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    What was shorted? Maybe it's recoverable.
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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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