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How to flash LN882H with open source Tasmota/Esphome style firmware - backup procedure included

p.kaczmarek2 63273 297

TL;DR

  • LN882H modules can be flashed over UART with open-source Tasmota/Esphome-style firmware to free cloud-controlled devices and integrate them with Home Assistant.
  • Wire module TX, RX, GND, 3V3, and BOOT/GPIOA9 to ground, and keep GPIOA9 low throughout the entire flashing process.
  • Backup uses `python LN882H_Flash_Dumper.py COMx flashdump`, and the firmware flash command is `LN882H_CMD_Tool.exe COMx download flash 921000 0x0 flashimage.bin`.
  • After flashing, power-cycle the module, disconnect BOOT from ground, and open 192.168.4.1 to configure it like other OpenBeken/Tasmota-style devices.
  • A reliable external 3.3V supply is recommended because powering directly from the USB-to-UART adapter’s 3.3V pin may fail.
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  • #91 21018952
    divadiow
    Level 38  
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    note that if you update a LN device to latest commit https://github.com/openshwprojects/OpenBK7231T_App/pull/1143 (Build on Mar 25 2024 12:49:16 version LN882H_1143_merge_b068861648fb) and you have powersave 1 set, the device will not connect to wifi but will need to be put into safe mode so you can switch to powersave 0.

    That was my experience just now anyway. I don't have an LN connected to uart to see boot log at the mo

    Added after 15 [minutes]:

    behaviour confirmed on two different devices. LN-02 switch and unmarked candle bulb module
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  • #92 21021475
    divadiow
    Level 38  
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    anyone else tried this PR with powersave 1?
  • #93 21021572
    rufus4
    Level 11  
    Posts: 65
    Rate: 8
    Hi everyone,
    may I ask some beginners questions?

    Yesterday I did flash a LN822H on the WL2S (blue pcb), part of the ELIVCO LSPA9. It worked so far without any problems.
    (btw at the moment you can get three of these units for €10 on ali)

    After playing arround with some settings I cant reach the userinterface anymore. Device does not show up on AP or the homenetwork.
    Reflashing is possible, but it does not clear the settings. Is there a way to clear settings over the flash-tool or any other way than wifi?
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  • #94 21021637
    divadiow
    Level 38  
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    rufus4 wrote:
    After playing arround with some settings I cant reach the userinterface anymore. Device does not show up on AP or the homenetwork.
    Reflashing is possible, but it does not clear the settings. Is there a way to clear settings over the flash-tool or any other way than wifi?


    Not sure I've had this with any LNs, but if the RF stuff gets messed up on Beken I've had to reflash factory firmware then re-OBK again. Might be something to try on LN?
  • #95 21021640
    miegapele
    Level 16  
    Posts: 173
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    You can just power on and off 5 times with short pause in between and it will come up in safe mode and create ap, the same as after initial setup. Then you can clean the settings
  • #96 21021646
    divadiow
    Level 38  
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    there are also some other command line bits to try

    eg

    .\LN882H_CMD_Tool.exe COM# flash erase_all

    and to see if it still has a mac

    .\LN882H_CMD_Tool.exe COM# mac read
    Attachments:
    • LN882H_Instructions_V1.0.16 (2).xlsx (15.35 KB) You must be logged in to download this attachment.
  • #97 21021655
    rufus4
    Level 11  
    Posts: 65
    Rate: 8
    thanks a lot for your hints!
    I´ll try.

    I think this happend when I did set Channel to remember state with "-1". Is there any problem with this setting? for me it looks like it messed all up.
  • #98 21021656
    divadiow
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    miegapele wrote:
    You can just power on and off 5 times with short pause in between and it will come up in safe mode and create ap, the same as after initial setup. Then you can clean the settings


    yes. it should just go into safe mode tho, which will ignore the -1 set, surely?
  • #99 21021687
    rufus4
    Level 11  
    Posts: 65
    Rate: 8
    when I checked for mac I could not acess datas "Fail. Could not go in ramcode mode."
    then I did erase flash and it was possibly again to ask for mac "mac:ff:ff:ff:ff:ff:ff"
    then reflashed, entered in ap mode and configured network settings, reboot, but still no acess from homenetwork, again not possible to ask for mac!

    I`ll try to reflash original fw

    --update---

    reflashing original fw did help at least to connect the device again on homenetwork
    thanks again!

    Added after 2 [hours] 19 [minutes]:

    One more question about understanding the hole materia.

    Why is my dump file from the HL882KHI 4MB? Docs say that this chip has got 2MB Flash. LN882H series comparison diagram showing memory and pin designation.
  • #100 21021878
    divadiow
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    rufus4 wrote:
    reflashing original fw did help at least to connect the device again on homenetwork
    thanks again!


    excellent

    rufus4 wrote:
    Why is my dump file from the HL882KHI 4MB? Docs say that this chip has got 2MB Flash


    https://www.elektroda.com/rtvforum/topic4008545-150.html#20935788

    tbh I thought the .py file had been updated wherever it can be downloaded from

    Added after 2 [minutes]:

    divadiow wrote:
    Not sure I've had this with any LNs, but if the RF stuff gets messed up on Beken I've had to reflash factory firmware then re-OBK again. Might be something to try on LN?


    actually I have https://www.elektroda.com/rtvforum/topic4008545-90.html#20914464
  • #101 21022078
    max4elektroda
    Level 24  
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    divadiow wrote:
    anyone else tried this PR with powersave 1?

    Finally I did. And with "strange" results:

    Changing "startup command" to set "PowerSave 1" and restart, device will connect to WiFi, log will dispaly " ... POWERSAVE", but current used is unchanged at ~ 90mA.

    BUT: If I set "PowerSave 1" from the "Command Tool", the current drops to ~ 55mA !!!

    So for me, setting Powersave doesn't work as startup command - but it does as a command.
  • #102 21022084
    divadiow
    Level 38  
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    oh that is interesting!
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  • #103 21022086
    max4elektroda
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    But this is just tested on my bare module, not the one in a plug, which would need to "count energy interrupts".
    And: GUI is very slow now.
  • #104 21022087
    divadiow
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    I think I'll try again
  • #105 21022109
    max4elektroda
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    Since WiFi did work, I also tried on my plug:
    Seems to work quite o.k., the energy values shonw are reasonable and, best to say, after about 10 minutes the temperature is ~ 30°C, with a simple load of 25W !
    The bare module used to be around 35°C, not even inside a case, not to speak about realy, power converters ...

    Added after 7 [minutes]:

    Switched to "PowerSave 0", and one minute later temperature is well beyond 40° (over 45° just now).

    Added after 4 [minutes]:

    Switched back to PowerSave 1 at 47.8°
    After 3 minutes, temperature is 37.2°

    Added after 6 [minutes]:

    But it is really very slow (toggling switch took me 10 seconds) and readings for BL0937 are not updated as it seems :-(

    Added after some more [minutes]:
    This might have been a problem on my client.
    Now it looks o.k. I see readings for BL0937 changing again and switching is o.k.
    Temperature around 35° - that really looks good for me now (no long term test though)
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  • #106 21022157
    divadiow
    Level 38  
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    p.kaczmarek2 wrote:
    typedef enum
    {
        ACTIVE          = 0,
        LIGHT_SLEEP     = 1,
        DEEP_SLEEP      = 2,
        FROZEN_SLEEP    = 3,
    } sleep_mode_t;


    Which of these corresponds to new powersave commands? What states are we entering?

    Added after 11 [minutes]:

    light sleep I guess

    https://github.com/openshwprojects/OpenBK7231...mits/e58abff715e43ebdf0a9c67daea143f273f2123c
  • #107 21022179
    max4elektroda
    Level 24  
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    In cmd_main.c is:

    Code: text Expand Select all Copy to clipboard
    #elif defined(PLATFORM_LN882H)
	if (bOn) {
		sysparam_sta_powersave_update(WIFI_MAX_POWERSAVE);
		wifi_sta_set_powersave(WIFI_MAX_POWERSAVE);
	}
	else {
		sysparam_sta_powersave_update(WIFI_NO_POWERSAVE);
		wifi_sta_set_powersave(WIFI_NO_POWERSAVE);
	}
#else


    Ahh, I just realized, we are talking about different things!
    Sorry, I tried with the release version, not the one from the PR.

    I hope I didn't misguide you with my posts.
  • #108 21022196
    divadiow
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    oh lol.

    im testing Build on Mar 25 2024 12:49:16 version LN882H_1143_merge_b068861648fb

    I have powersave 0 in startup command at the moment but have tried switching to powersave 1 in web app and ALSO see the temperature drop as well as the power consumption.

    This is the power consumption starting with powersave 0 with the 0.6-0.7w readings then powersave 1 with 0.3-0.5w readings from about 8s into the video





    but now I don't know where the PR fits into all this.

    Added after 9 [minutes]:

    i can't say im seeing a slow down with powersave 1 on the PR build though

    Added after 3 [minutes]:

    I'm just testing with this LN candle lamp. it was getting too hot with the bulb lit and it would reboot after a few minutes. temps were 80+ degrees C. see how long it lasts...

    Screenshot of the OpenLN882H_C25E1088 interface with controls for LED brightness and color temperature.

    Added after 54 [minutes]:

    bulb still on and online, which is a novelty. BP5758D_Current 1 1 set though so LEDs are LOW.

    Screenshot of a web application interface showing internal temperature and WiFi status.

    will try BP5758D_Current 5 5

    Added after 18 [minutes]:

    Too hot at 5 5, rebooted. Will try 3 3
  • #109 21022423
    p.kaczmarek2
    Moderator Smart Home  
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    That's a lot t process! Ok, here are two quick tips from my side:
    - BL0937 is known to work bad with powersave because BL0937 requires a change interrupt to work in order to count CF/CF1 pulses
    - if somehow PowerSave must be run later, you can use delay_s in script of waitFor to wait for WiFi state
    I'm eager to see more results!
    Helpful post? Buy me a coffee.
  • #110 21024816
    rufus4
    Level 11  
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    I made an interesting discovery. Tried to measure the power consumption of the LSPA9 with LN822HKI and the BL0937, because I recocnised that its getting quiet hot.
    It looks like Tuya does not use any power save mode at all on this device with the WL2S board. And this is very interesting. (Or they just don`t care?)

    Measured with a DMM and a clamp meter the device's power with relays off and on.
    OpenLN882H_1.17.521 takes 8.5 and 12.5 mA
    original Tuya FW takes the same 8,5 and 12.5 mA (this is incredible 2/3Watts)

    OpenLN882H_1.17.521 with experimental "powersave 1" takes an average of 6.5 and 10.5 mA (but GUI is not stable, freezes after a while)

    For comparison, a shelly plug (16A) takes around 4/7mA which is only half of the Tuya firmware.

    (I know, my mesurement is not very accurate because of powerpeeks. But without powersave mode the consumption seems to be nearly constant.)

    p.kaczmarek2 wrote:
    - BL0937 is known to work bad with powersave because BL0937 requires a change interrupt to work in order to count CF/CF1 pulses

    maybe thats the point?
  • #111 21026099
    rufus4
    Level 11  
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    Is there a chance to get a DHT22 working on the LN882H?

    While setting the pins, I found all of this DHT's to choose on the list. So I thought I'll try and did solder one more pinout to pin 4 on the WL2S board and connected a DHT22.
    It looked like it got recognized and warned me to set two channels. But there are no values. Did I choose the wrong pin for that, do I need to start a driver or is there no such implementation in the FW?

    I know, maybe it's a bit too early for these thingies, but I love to fithering around with it and it would be nice to have temperature and humidity directly on a power plug to switch a dehumidifier. :)
    Device configuration screen with connected DHT22 sensor showing no temperature and humidity values.
  • #112 21026717
    p.kaczmarek2
    Moderator Smart Home  
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    rufus4 wrote:
    I
    Measured with a DMM and a clamp meter the device's power with relays off and on.
    OpenLN882H_1.17.521 takes 8.5 and 12.5 mA
    original Tuya FW takes the same 8,5 and 12.5 mA (this is incredible 2/3Watts)

    Thank you for those measurements! At least we know we're not making the power usage higher.

    rufus4 wrote:

    OpenLN882H_1.17.521 with experimental "powersave 1" takes an average of 6.5 and 10.5 mA (but GUI is not stable, freezes after a while)

    We will need to resolve that, but how... if anyone wants to help, check out our repository and give it a try.
    https://github.com/openshwprojects/OpenBK7231T_App

    rufus4 wrote:

    p.kaczmarek2 wrote:
    - BL0937 is known to work bad with powersave because BL0937 requires a change interrupt to work in order to count CF/CF1 pulses

    maybe thats the point?

    This is most likely the reason that no PowerSave is used on BL0937 devices.


    rufus4 wrote:
    Is there a chance to get a DHT22 working on the LN882H?

    rufus4 wrote:
    While setting the pins, I found all of this DHT's to choose on the list. So I thought I'll try and did solder one more pinout to pin 4 on the WL2S board and connected a DHT22.

    DHT sensors are handled per-pin:
    https://github.com/openshwprojects/OpenBK7231T_App/blob/main/src/driver/drv_dht.c
    The DHT pin roles are listed here:
    https://github.com/openshwprojects/OpenBK7231T_App/blob/main/docs/ioRoles.md
    The DHT update, however, seems to be disabled for LN882H currently:
    Screenshot of Visual Studio editor with the user_main.c file open.
    Let me try checking this out. I will update LN882H makefile to include DHT driver and then add enable there.

    Added after 6 [minutes]:

    DHT step 1:
    https://github.com/openshwprojects/OpenLN882H/commit/0467665d75a879d3024f538a5d31c313f844fc16
    Now I will try to enable it in app...

    Added after 1 [hours]:

    I think i enabled it, it should work on LN882H with 1.17.527 build, but I am not able to test...
    https://github.com/openshwprojects/OpenBK7231...mmit/f27907593411632f7186e0e9e6ff4e572880cf0f
    I also later moved the define to the correct place:
    https://github.com/openshwprojects/OpenBK7231...mmit/d38957aee0cbcbb745a1975447024ce6d7f54b45
    It should be more obvious now how do we enable DHT on new platform.
    Helpful post? Buy me a coffee.
  • #113 21027619
    rufus4
    Level 11  
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    First, I do have to say again that I'm a poor beginner and please for passion.
    And now one more question. Does the drivers start by themselves? DHT and NTP drivers I never have seen listed as working on the main GUI page.

    I think I made a mistake. I connected pin B4, but selected it as Pin 4.
    Which Pin number is B4 then on the list from 1-25?
  • #114 21027731
    max4elektroda
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    rufus4 wrote:
    Does the drivers start by themselves? DHT and NTP drivers I never have seen listed as working on the main GUI page.

    You will have to start the drivers on the "execute custom command" line:
    Its "startDriver <driver>" e.g.
    Code: text Expand Select all Copy to clipboard
    startDriver NTP
    to start NTP.

    Only BL0937 is an exception and starts automatically.
    Correction: DHT also has an autostart.

    Added after 9 [minutes]:

    Regarding the pins: in the gui you can select B4 directly.
    It will be mapped to pin 20 in the config file (A# pins are 0 to 15, so the pin B0 is 16 and so on).
  • #115 21027744
    p.kaczmarek2
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    @max4elektroda I think that DHT also has an autostart, it's actually handled outside drv array. Still, NTP has to be started as you shown.
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  • #116 21027834
    rufus4
    Level 11  
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    Thanks a lot, finally I selected the right pin B4 now. Somehow it would have been too easy, open my eyes a bit wider only. :)

    But still DHT does not work in my case. And if I try to start the DHT driver manually, there is none on the list. Same with the newest build .530.
    --updated--
    Screenshot of a device control panel showing data related to a DHT22 sensor and other system parameters.


    max4elektroda wrote:
    to start NTP.

    Only BL0937 is an exception and starts automatically.


    does only start manually on my LN882H, but it works fine. How can I set a different NTP server IP? Couldn't find any information about that.
  • #117 21027880
    max4elektroda
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    rufus4 wrote:
    How can I set a different NTP server IP? Couldn't find any information about that.

    After starting the NTP driver, you can set the server with "ntp_setServer <IP>"
  • #118 21028284
    piotrret
    Level 13  
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    Board Language: polish
    Hello.
    I have a question about the NTP server.
    In the Startup command menu I have: startDriver ntp
    The problem is that the time after today`s time change is incorrect, so I also added: startDriver ntp; ntp_timeZoneOfs +2
    After this change, when I restarted the device, the NTP server no longer starts.
    I tried to create an autoexec.bat file to include these two commands, but the file was not created. Is the LittleFS mechanism implemented in the current version of OpenLN882H_1.17.524_OTA software?
  • #119 21028427
    p.kaczmarek2
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    @piotrret to enter more than one command in the short startup command should be used backlog : :
    Code: text Expand Select all Copy to clipboard
    
backlog first command; second command etc; third

    Just like in Tasmota.
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  • #120 21028556
    piotrret
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    Board Language: polish
    It works, thanks for the tip. I just wanted to ask about creating files, because, as I wrote earlier, I tried to create the autoexec.bat file, but after pressing the List Filesystem button, nothing appears, even though after using the Create File function, Screenshot of a filesystem interface showing the process of creating files and listing items in LittleFS. I have the message saving file...save complete...
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Topic summary

✨ The discussion focuses on flashing LN882H modules with open-source firmware similar to Tasmota/Esphome, enabling cloud-free operation and integration with Home Assistant. Flashing requires a USB to UART converter with reliable 3.3V power supply, connecting module TX to UART RX, RX to TX, GND to GND, and 3.3V to 3.3V. Users report challenges including access to the BOOT pin, interference from board components on RX/TX lines, and the necessity of short wiring to ensure stable flashing. Various USB to UART converters (CH340, FT232RL, PL2303, CP2101) have differing success rates; CH340 and CP2101 are recommended over some FTDI and PL2303 adapters. Correct baud rate (115200) and running the flashing tool from non-system drives (e.g., D:) improve success. The LN882H_CMD_Tool is used for flashing and dumping firmware; flashing requires power cycling and keeping BOOT grounded during operations. Users successfully dumped firmware but often encountered "Fail. Error downloading file" during flashing, resolved by adjusting baud rate, shortening cables, and using compatible USB-UART adapters.

Power-saving features are under active development; enabling PowerSave mode reduces power consumption and device temperature but may cause WiFi connection issues in some firmware versions. PowerSave commands can be set via startup commands or command tool, with better effect when applied directly via command tool. Temperature monitoring shows LN882H devices run hot (up to 74°C) without load, improved by PowerSave mode. Integration with energy metering (BL0937) is affected by PowerSave due to interrupt handling. Static IP assignment is currently unimplemented in firmware. DHT sensor support is partially implemented; drivers require manual start commands, and pin mapping must be correct. NTP client requires manual driver start and supports server IP configuration via commands. Safe mode can be triggered by power cycling to reset device settings. Firmware and tools are evolving with ongoing commits addressing power management, filesystem (LittleFS), and device stability.

Overall, flashing LN882H modules demands careful hardware setup, compatible USB-UART adapters, correct flashing parameters, and power cycling. Firmware features like power saving, sensor support, and network configuration are improving but still have limitations. Community contributions and testing continue to enhance LN882H open-source firmware usability and integration.
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FAQ

TL;DR: 70 °C internal temperature was logged on stock settings, but drops to 32 °C after PowerSave 2; “LN882H flashing is very similar to ESP8266 flashing” [Elektroda, p.kaczmarek2, post #20923772] Use 115 200 baud and keep BOOT (A9) low for reliable uploads [Elektroda, voodoopt, post #20958664]

Why it matters: Correct wiring, speed and power rules prevent bricked modules and overheating.

Quick Facts

• Flash size: 2 MB NOR, dump script trimmed to 0x200000 bytes [Elektroda, divadiow, post #21284784] • Stable upload speed: 115 200 baud; 2 Mbit/s often fails [Elektroda, voodoopt, post #20958664] • BOOT=A9 must stay at GND from power-on until flashing ends [Elektroda, p.kaczmarek2, post #20905518] • PowerSave 2 cuts idle current from ≈55 mA to 35 mA (-36 %) [Elektroda, max4elektroda, post #21064064] • OTA bug fixed in releases ≥1.17.789; Firefox now works [Elektroda, divadiow, post #21332121]

1. What minimum hardware is required to flash an LN882H module?

  1. USB-to-UART adapter that outputs true 3 V3 (CH340 or CP2102 proven). 2. Solid 3 V3 supply ≥300 mA; many adapters sag. 3. Five leads: 3 V3, GND, RX, TX, BOOT (A9). 4. Optional: pogo pins or fine wires for in-circuit work [Elektroda, p.kaczmarek2, post #20905518]

2. Which pins go where?

• Module TX → UART RX • Module RX → UART TX • 3 V3 ↔ 3 V3 • GND ↔ GND • A9 (BOOT) ↔ GND (keep low) Any disconnect of A9 before power-cycle aborts flashing [Elektroda, p.kaczmarek2, post #20905518]

3. How do I enter download mode every time?

  1. Hold A9 at GND. 2. Remove and re-insert USB power to both UART and module. 3. Start flash command. After any failure repeat the full power cycle—soft reset is not enough [Elektroda, p.kaczmarek2, post #20933029]

4. Flash tool stops with “Fail. Error downloading file”. Fix?

Set baud to 115 200 bps; many CH340/FTDI clones error at 2 000 000 bps. Example: “Ok.” after lowering speed on COM21 [Elektroda, voodoopt, post #20958664]

5. Can I flash without desoldering the module?

Yes, if you can grip A9 and ensure RX/TX lines are not tied to buttons or capacitors. Cut the trace or lift parts if debouncing cap blocks UART [Elektroda, p.kaczmarek2, post #20923772]

6. Quick 3-step firmware backup before experimenting?

  1. python LN882H_Flash_Dumper.py COMx flashdump 2. Wait ~5 min for 2 MB readout. 3. Verify flashdump_flash.bin size == 2097152 bytes [Elektroda, divadiow, post #21284784]

8. How do I enable PowerSave automatically?

Add in Startup Command: backlog delay_s 5; PowerSave 2. From release 1.17.772 the firmware applies PowerSave after Wi-Fi connects, so no boot lock [Elektroda, max4elektroda, post #21064290]

9. Edge-case: BL0937 energy meter shows 125 V after PowerSave.

PowerSave disables the interrupt clock BL0937 needs. Keep PowerSave 0 on power-monitor plugs or voltage reading will be wrong [Elektroda, max4elektroda, post #21052031]

10. OTA upload crashes when I use Firefox. Work-around?

Firmware ≤1.17.772 overflowed a 4 kB buffer when the header and payload arrived in one TCP packet, often triggered by Firefox. Patched in 1.17.789 (PR #1441) [Elektroda, max4elektroda, post #21319958] Use Chrome or update firmware.

11. How can I reset a forgotten Web-UI password?

From 1.17.800 you can power-cycle, then enter 5 wrong logins within 3 min; firmware offers full config reset unless Flag 77 disables it [Elektroda, max4elektroda, post #21086964]

13. Linux/Mac flashing tool available?

Yes. Open-source LN882Loader (CLI) handles dump and flash on Linux/macOS; requires PySerial [ste­fanmandl, 2025].

15. How do I change a duplicate MAC address?

mac write xx:xx:xx:xx:xx:xx works but device reboots with new IP. Verify the MAC is unique before saving [Elektroda, Advian1, post #20996463]

16. Quick How-To: flash in 3 steps

  1. Hold A9 → GND, power module.
  2. LN882H_CMD_Tool COMx download flash 115200 0x0 OpenLN882H_xxx.bin
  3. Power-cycle, release A9, connect to AP 192.168.4.1 and configure.
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