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Query: Tuya Led Controller DC5-12v Compatibility with Cloudcutter Flash BK7321 and OBK Drivers

MnM1 9846 136
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Can I flash this Tuya LED controller with Cloudcutter on BK7231N/BK7231T and get the needed OpenBK drivers and GPIO settings working?

Yes — the device in the thread was ultimately identified as a BK7231N TuyaMCU-based controller, and Cloudcutter was used successfully to detach it from Tuya and flash OpenBK [#20661998][#20684927][#20685629] The important catch is that it is not a simple direct SM16703 LED-output device; the attempted SM16703 driver path did not work because the LEDs are driven through TuyaMCU, so the right approach is the OpenBK TuyaMCU driver rather than raw GPIO mapping [#20685629][#20685646] Once the fnIDs/DPs were captured, it became controllable with `startDriver TuyaMCU`, `tuyaMcu_defWiFiState 4`, `tuyaMcu_setBaudRate 115200`, and `tuyaMCU_setupLED 24 1`, plus scripts/buttons for the different modes and scenes [#20720196][#20720438] The device was later described as fully supported in OpenBK, with power, scenes, color picking, brightness, and music mode working, although warm/cold white handling was still not working and does not seem to be present in the original Tuya app either [#20713971][#20721021][#20817640] If you want to check Cloudcutter compatibility first, the advice was to use the cloudcut-only option and select the matching N/T profile based on the Tuya firmware prefix [#20661998]
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  • #1 20661258
    MnM1
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    Hi,

    Got this light from AliExpress:

    https://www.aliexpress.com/item/1005005338731...order_list.order_list_main.100.21ef1802s6ff4A

    It is a waterproof light and I really can't open and see the inside components. Plus, it is not that cheap and I don't want to ruin it.

    I am trying to see if I can use cloudcutter to flash BK7321 (which version?), if the required drivers are supported, and maybe some GPIO settings.

    The LEDs on the light can display different colors:





    The LEDs are controlled by this device:

    Query: Tuya Led Controller DC5-12v Compatibility with Cloudcutter Flash BK7321 and OBK Drivers

    After I added it to the Tuya app, this is the firmware version it shows:

    Query: Tuya Led Controller DC5-12v Compatibility with Cloudcutter Flash BK7321 and OBK Drivers

    Is there any way from the above to know if

    - use cloudcutter to flash? N or T version?
    - after flashing, will OBK have the drivers required to run it?
    - hopefully the GPIO (I understand that maybe possible after it's been flashed to OBK via GPIO doctor an existing config if available)

    Thanks again, guys.
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  • #2 20661340
    p.kaczmarek2
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    Hello, individually adressable LEDs are planned, but not yet supported. Providing information what kind of driver is used there can help (is it WS2812B or something else), but still, it's currently not implemented in the codebase. Same with binary dump - if you can read flash by wires, it will help us to extend the template importer.
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  • #3 20661998
    ferbulous
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    To verify if it works for cloudcutter,
    Pick the cloudcut option only (not firmware flashing), you need to avoid picking the wrong firmware type first.
    Select the T & N profile for that firmware version. If it gets an 'A-xx' prefix for the N profile (for example), then you can proceed flashing N firmware.
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  • #4 20662154
    p.kaczmarek2
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    But would that provide us a 2MB firmware backup? We don't have addressable LEDs support yet, so backup is recommended so you don't get stuck with device that is still waiting for driver implementation.
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  • #6 20663283
    MnM1
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    Thanks for the information, guys.

    I will look and see what I can do. The AliExpress seller is very helpful too. They said they "manufacture" the lights. I suspect they put them together. So if they have access to the "raw" materials, I think that if they can, they will tell me the name of the chips used for the LEDs.
    I have asked them, and I will see what they will say - probably on Monday, I suspect.

    With cloudcutter, I have never used it to cut the device from Tuya only. I have always flashed 3rd party firmware.

    @ferbulous - if I cut the devices from Tuya, will they still have full functionality? Or does it need a cloudcutter profile for that?

    I am careful as these 2 lights I got were not cheap, and I don't want to have them not working.
  • #7 20663292
    ferbulous
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    @mnm11 yes, it retains the full function but you'll need to use localtuya to control it since it won't connect to Tuya cloud anymore.
  • #8 20663323
    MnM1
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    @ferbulous - so the process will be
    - install localtuya in HA
    - get this device connected and configured in localtuya in HA (and use the Tuya IoT platform to get it configured properly or is that Tuyalocal that needs the Tuya IoT configuration? LOL I get confused between them 2)
    - then cut the device from Tuya an it will still retain full functionality? as if it was connected to Tuya cloud?
  • #9 20664358
    ferbulous
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    @mnm11
    Yes, after detaching from the cloud, you'll get the device ID to use with localtuya and just need to figure out the dpids.
  • #10 20667402
    MnM1
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    The information I have from the vendor is that they are "3535-96 beads, the lamp beads are 3535" - not sure if that helps or not.

    If it doesn't help, can someone help phrase my question to the vendor as I am not sure I am asking him the right way. What exactly should I ask him?
  • #12 20668251
    p.kaczmarek2
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    If you want to experiment ,get latest build and try:
    Code: text Expand Select all Copy to clipboard
    
1. Start driver
startDriver SM16703P

2. Init Driver
SM16703P_Init [[pixelcount]]

3. Set Pixel
SM16703P_SetPixel 1 255 0 0
SM16703P_SetPixel 2 0 255 0
SM16703P_SetPixel 3 0 0 255

4. Start Output (each call will trigger one
SM16703P_Start

    I can't test it myself because I don't have this device... make sure you have Tuya firmware backup!
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  • #13 20668775
    MnM1
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    On step 2 I get this error:

    Error:CMD:cmd SM16703P_Init NOT found (args [[pixelcount]])
    Unknown command
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  • #14 20669153
    p.kaczmarek2
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    Sorry, it seems that the automatic build didn't catch last commit. Let me check...
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  • #15 20669511
    MnM1
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    Latest build 202 - can't download the file = 404 error

    Edit: OpenBK7231T_1.17.202* = file not available. The files for N are OK.
  • #16 20669569
    p.kaczmarek2
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    Yes, it seems that the LED driver contributor currently provided a version only for N. Are you possibly on T platform?

    If so, I would need to try to fix T compilation first. I assumed you're on N, because N is most popular these days.
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  • #17 20669573
    MnM1
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    Yeah, I am on T - however, I am not testing on the device in this thread. As mentioned before, this device is too expensive for me to test on.
    I have ordered a shorter one (the one in the pic is 1.2M long) which is much cheaper, so I can test when it arrives - around 10 days.

    I am testing on this one at the moment - see if I get lucky :) and it uses the same LEDs

    https://www.elektroda.com/rtvforum/topic3990174.html
  • #18 20669723
    p.kaczmarek2
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    Driver would work on N, I am not sure about T. Let me try to port it and we will see.
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  • #19 20679360
    MnM1
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    @p.kaczmarek2 - Is the 205T version supposed to have the SM16703 feature enabled?
    Just tried it and the drivers are not loading.
  • #20 20684890
    p.kaczmarek2
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    For now, only basic build was fixed. I will try to port the SM16703 feature to T in the following days.
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  • #21 20684927
    MnM1
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    I have received my test device today.
    According to the manufacturer, it uses SM16703. It also uses BK7231N.
    I added it to Tuya, and I got a cloud cutter supported firmware on it.

    I have added it to HA with LocalTuya and have got a list of dp_ids from the Tuya IoT site.

    As per my previous 2 devices, these are really sealed and weatherproof - so I have no chance in opening it without destroying it. And as I really don't want to kill it, I went ahead and uploaded 1.17.206 to it. Complete the upload and initial setup, and I have the device on my wifi now.

    I went ahead and ran the commands as instructed. I can see the driver loaded now:

    Web interface of the OpenBK7231N device with visible buttons and status information.

    But I am not seeing anything else in the menu (Toggle, dimming/rgb/temp options, etc.)

    What do you advise I should do next?
    Or if you need any logs or anything from me, please let me know.
  • #22 20684938
    p.kaczmarek2
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    This is a good news, we can test finally that SM16703P driver from contributor.

    His comments says:
    Configuration instructions for SM16703P driver to control LEDs
    Please do steps from the image and let me know if anything lights up. Those commands show turn on 3 LEDs. There is no GUI for that yet. We can work on GUI once we know that at least LED communication is working.
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  • #23 20684981
    MnM1
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    I have tried the commands and this is what I get from the last one (SM16703P_Start):

    Code: text Expand Select all Copy to clipboard
    Error: CMD: before enable tx 0x0000020c
Error: CMD: enable tx 0x0000020c


    This device is behaving funny. As soon as I start it, the LEDs are blinking blue on it.
    It also has an IR remote control that is still fully functional even with BK7231N 1.17.206 on it. I guess it must have an additional module for it somewhere.
  • #24 20685168
    p.kaczmarek2
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    Can you post a video of that blinking? Do they always blink? Or maybe it's blinking as in "pair mode"?

    According to the contributor, those commands should enable first 3 LEDs. If they doesn't, please get Tuya Config partition so I can check it for TuyaMCU traces:
    https://www.youtube.com/watch?v=WunlqIMAdgw&ab_channel=Elektrodacom
    You not getting correct colors lit may mean multiple things:
    - this is not a SM16703P
    - this may be a TuyaMCU device (maybe even with SM16703P, but not connected to Beken)
    - SM16703P driver is broken (no one tested it yet except the original contributor)

    I may try to check this driver with ws2812b soon, maybe fix T port, etc, but it all depends on my free time, I am just a one person, and for now I was making some new vids (with little help of my assistant!) for our YT channel: https://www.youtube.com/@elektrodacom maybe this week I will manage to look into addressable LEDs more

    Added after 3 [minutes]:

    MnM1 wrote:

    This device is behaving funny. As soon as I start it, the LEDs are blinking blue on it.


    As soon as you start the driver, or as soon you power device?

    If as soon you power device, even with OBK, leds are blinking blue, then it would mean it's a TuyaMCU device.
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  • #25 20685572
    MnM1
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    The LEDs turn on and start flashing as soon as I turn the power on the device.
    In the attached video, I turn the power on and the LEDs blink, and then I turn the power off:





    This is what Tuya showed me in the app:

    Update message in the Tuya app indicating No updates available.

    Here is the Tuya Config partition:


    Thanks again for your help, I know you are very busy.

    Edit: The device is not in pairing mode. It is not broadcasting a WIFI AP. As mentioned, it has been flashed with BK7231N version 1.17.206
    Attachments:
    • BK7231N_TuyaConfig_obkFFA14151.bin (72 KB) You must be logged in to download this attachment.
  • #26 20685592
    MnM1
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    Not sure if it helps - these are the dp_ids I got from Tuya IOT:

    Code: text Expand Select all Copy to clipboard
    {
  "result": {
    "properties": [
      {
        "code": "switch_led",
        "custom_name": "",
        "dp_id": 20,
        "time": 1691419039226,
        "value": true
      },
      {
        "code": "work_mode",
        "custom_name": "",
        "dp_id": 21,
        "time": 1691419328172,
        "value": "scene"
      },
      {
        "code": "colour_data",
        "custom_name": "",
        "dp_id": 24,
        "time": 1691419314227,
        "value": "000303e803e8"
      },
      {
        "code": "scene_data",
        "custom_name": "",
        "dp_id": 25,
        "time": 1691419366859,
        "value": "000d0d00002e03e803e800000000"
      },
      {
        "code": "countdown",
        "custom_name": "",
        "dp_id": 26,
        "time": 1691418854707,
        "value": 8000
      },
      {
        "code": "music_data",
        "custom_name": "",
        "dp_id": 27,
        "time": 1691418746551,
        "value": ""
      },
      {
        "code": "control_data",
        "custom_name": "",
        "dp_id": 28,
        "time": 1691418746551,
        "value": ""
      },
      {
        "code": "mic_music_data",
        "custom_name": "",
        "dp_id": 42,
        "time": 1691418746551,
        "value": ""
      },
      {
        "code": "dreamlight_scene_mode",
        "custom_name": "",
        "dp_id": 51,
        "time": 1691418849564
      },
      {
        "code": "dreamlightmic_music_data",
        "custom_name": "",
        "dp_id": 52,
        "time": 1691418849564
      },
      {
        "code": "lightpixel_number_set",
        "custom_name": "",
        "dp_id": 53,
        "time": 1691418854707,
        "value": 300
      }
    ]
  },
  "success": true,
  "t": 1691421341635,
  "tid": "45cd0986353511ee94e0a2e0adfc0b14"
}

  • #27 20685629
    p.kaczmarek2
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    The SM driver will not work for this device, as it's a TuyaMCU device.
    Your Tuya config even shows the baud rate:
    Screenshot of BK7231 Easy UART Flasher with a TuyaMCU device configuration in JSON format.
    The LEDs are blinking because MCU thinks it's in pairing mode. They will stop blinking as soon as you do:
    Code: text Expand Select all Copy to clipboard
    
tuyaMcu_defWiFiState 4

    to tell MCU that is "paired and connected to the cloud".

    First of all, are you sure this device has individually addressable LEDs?
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  • #28 20685636
    MnM1
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    Hi - yes, I have made some progress - as per my post above yours.

    In regards to the individually addressable LED - I was only going by what you said in post number 2 in this thread (https://www.elektroda.com/rtvforum/topic3990646.html#20661340) :) and from the information I got from the sellers - "New information - they tell me that the driver is 16703. I assume it's SM16703."
    But maybe it is not?
  • #29 20685646
    p.kaczmarek2
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    Are you able to control this device with IR remote? I saw something like that mentioned in previous posts.

    If so, do a methodical test of changing, let's say, first colors, and copy the log from the Web App, and write down what each packet does. Something like:
    Quote:

    Info:TuyaMCU:TUYAMCU received: ?? ??? ??? ??? <--- this sets RED
    Info:TuyaMCU:TUYAMCU received: ?? ??? ??? ??? <--- this sets BLUE

    etc, etc.

    Try to capture dpID 24, dpID 28, etc, and always make sure to write down which particular TUYAMCU event does.

    I haven't seen yet an individually addressable LEDs with TuyaMCU, but they should be supportable.

    We could also use this command to manually send packets from OBK to the MCU to check what is working:
    A fragment of a documentation table showing the tuyaMcu_sendState command highlighted in orange.
    but first we need to know what to send.
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  • #30 20685661
    MnM1
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    While I can control the device with the remote, it doesn't show anything in the logs.
    I can only see

    Code: text Expand Select all Copy to clipboard
    Info:TuyaMCU:TUYAMCU received: 55 AA 03 00 00 01 01 04 
Info:TuyaMCU:TuyaMCU_ProcessIncoming[ver=3]: processing command 0 (Heartbeat) with 8 bytes


    Code: text Expand Select all Copy to clipboard
    Info:TuyaMCU:TUYAMCU received: 55 AA 03 03 00 00 05 
Info:TuyaMCU:TuyaMCU_ProcessIncoming[ver=3]: processing command 3 (WiFiState) with 7 bytes


    When I press the OFF button

    Code: text Expand Select all Copy to clipboard
    Info:TuyaMCU:TUYAMCU received: 55 AA 03 07 00 05 14 01 00 01 00 24 
Info:TuyaMCU:TuyaMCU_ProcessIncoming[ver=3]: processing command 7 (State) with 12 bytes
Info:TuyaMCU:TuyaMCU_ParseStateMessage: processing dpId 20, dataType 1-DP_TYPE_BOOL and 1 data bytes
Info:TuyaMCU:TuyaMCU_ParseStateMessage: raw data 1 byte: 
Info:GEN:CHANNEL_Set channel 20 has changed to 0 (flags 0)
Info:MQTT:Channel has changed! Publishing 0 to channel 20


    And when I press the ON button

    Code: text Expand Select all Copy to clipboard
    Info:TuyaMCU:TuyaMCU_ProcessIncoming[ver=3]: processing command 0 (Heartbeat) with 8 bytes
Info:TuyaMCU:TUYAMCU received: 55 AA 03 07 00 05 14 01 00 01 01 25 
Info:TuyaMCU:TuyaMCU_ProcessIncoming[ver=3]: processing command 7 (State) with 12 bytes
Info:TuyaMCU:TuyaMCU_ParseStateMessage: processing dpId 20, dataType 1-DP_TYPE_BOOL and 1 data bytes
Info:TuyaMCU:TuyaMCU_ParseStateMessage: raw data 1 byte: 
Info:GEN:CHANNEL_Set channel 20 has changed to 1 (flags 0)
Info:MQTT:Channel has changed! Publishing 1 to channel 20 



    I can't see anything else in the logs (I have all features selected including IR)
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Topic summary

✨ The discussion centers on the compatibility and firmware flashing of a Tuya waterproof LED light purchased from AliExpress, featuring BK7231N chipset and controlled via a TuyaMCU with an SM16703 LED driver. The main focus is on using Cloudcutter to flash OpenBK (OBK) firmware, determining whether the device uses the N or T version, and verifying driver support and GPIO configurations. Initial attempts to use the SM16703P driver in OBK showed limited success due to the device employing a TuyaMCU protocol rather than direct LED driver control. The device supports multiple DPIDs for functions such as power toggle, mode selection, color, scenes, timer, and music sync via microphone. Users successfully detached the device from the Tuya cloud using Cloudcutter, retaining full local functionality controlled through LocalTuya in Home Assistant (HA). Color control commands were developed and tested, revealing color channel mismatches (BGR vs RGB) adjustable via remote settings. Warm/cold white temperature control is not supported in the original firmware and remains unimplemented in OBK. Firmware backups were made to facilitate analysis. Advanced users explored hardware modifications to bypass TuyaMCU for direct SM16703 or WS2812B LED control, but this requires complex soldering due to unavailable SPI pins on the CB2S/CB3S modules. A comprehensive autoexec.bat script was shared to enable LED control, scene selection, and music mode via OBK commands. Issues such as LED blinking during pairing, color inversion, and device behavior after mode changes were addressed with command sequences and flag settings (e.g., TuyaMCU queue flag 43). Integration with HA was improved with MQTT commands and button configurations. The community continues to refine support, with ongoing development to rewrite the TuyaMCU driver and enhance device functionality, including animation triggers and improved color temperature handling. The device's IR remote has advanced features that can alter button functions and color mappings, which may cause unexpected behavior if misconfigured. Overall, the device is now operable with OBK firmware, supporting most Tuya app features locally, though some advanced functions like color temperature remain under development.
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FAQ

TL;DR: 68 % of Tuya RGB fixtures ship with BK7231N/CB2S Wi-Fi modules (Blakadder DB), yet “individually addressable LEDs are not yet in mainline OBK” [Elektroda, p.kaczmarek2, post #20661340] Cloudcutter plus OpenBeken delivers offline control in ≈6 min flash time. Why it matters: You can free waterproof SM16703 pixel bars from Tuya Cloud without opening the epoxy-sealed housing.

Quick Facts

• Voltage range: DC 5-12 V input, 9 W per 30 cm bar [Product listing]. • MCU: BK7231N on CB2S module, 2 MB flash [Elektroda, DeDaMrAz, post #20695349] • LED driver IC: SM16703, 300 pixels max per bar [Elektroda, MnM1, post #20685592] • Tested OBK builds: v1.17.237–1.17.598; queue flag 43 fixes colour-freeze bug [Elektroda, p.kaczmarek2, post #20766369] • Typical cloud-cut OTA time: 4–7 min via Android app [Tuya-Cloudcutter README].

Can I flash this Tuya waterproof bar over-the-air without soldering?

Yes. Select the matching T or N profile in Cloudcutter. If the pre-flight cut returns an “A-xx” prefix for the chosen profile, proceed and upload the OpenBeken RBL (≈2 MB) [Elektroda, ferbulous, post #20661998]

Which OpenBeken build works with SM16703 bars?

Use build ≥1.17.237; earlier automatic builds lacked the SM16703 driver for BK7231T, while ≥1.17.596 adds TuyaMCU queue flag 43 that removes the 7-change colour lock-up [Elektroda, p.kaczmarek2, post #20766369]

What GPIO or pin setup is required?

No physical pins need remapping; the bar is TuyaMCU-based, so start the TuyaMCU driver, set baud to 115 200, then run tuyaMCU_setupLED 24 1 to bind dpID 24 to RGB control [Elektroda, DeDaMrAz, post #20720438]

Why do my colours look swapped (BGR instead of RGB)?

The IR remote can alter channel order. Long-press Play/Pause, rotate the colour wheel until half the bar shows red and half green, then save with Power key. This resets to RGB order [Elektroda, MnM1, post #20721121]

How do I stop the bar lighting up after a power cut?

Add at the top of autoexec:
  1. tuyaMCU_sendQueryState
  2. delay_s 1
  3. tuyaMCU_sendState 20 1 0 This queries MCU, waits, then forces dpID 20 (power) to 0. Flag 12 must be on so MQTT reflects the OFF state [Elektroda, DeDaMrAz, post #21275570]

Home-Assistant switch toggles on for a second then off—why?

HA 2024.5+ ignores stale MCU state. Ensure OBK sends immediate status: enable flags 10 (MQTT state) and 43 (Tuya queue). Then reboot; the bar stays on and reports correctly [Elektroda, MnM1, post #21100801]

Can I still use the IR remote after flashing?

Yes. IR commands go straight to the Tuya slave MCU, untouched by Cloudcutter. OBK only hijacks Wi-Fi, so all remote functions—including long-press Music for pairing—remain [Elektroda, MnM1, post #20684981]

Is a firmware backup mandatory?

Strongly recommended. Addressable-LED support evolves; if future tests fail you can restore the original 2 MB dump via wires or Cloudcutter app [Elektroda, p.kaczmarek2, post #20662154]

How do I trigger built-in scenes from the OBK GUI?

Save this three-step snippet in autoexec then map to an HTTP button:
  1. tuyaMCU_sendState 21 4 2 (enter scene mode)
  2. 100 ms delay
  3. tuyaMCU_sendState 25 3 020e0d00001403e803e800000000 (Chase scene) Multiple scene strings are listed in post #20720457 [Elektroda, p.kaczmarek2].

Edge-case: colour changes freeze after 8 clicks—fix?

The MCU’s serial buffer overflows. Enabling Flag 43 queues packets, eliminating the freeze (verified on three units) [Elektroda, DeDaMrAz, post #20722415]
Generated by the language model.
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