Having problems flashing OpenBK7231T OTA on a device that's already been flashed with EspHome (tuya)

Hi, I have successfully flashed OpenBK7231T using tuya-cloudcutter and all is working well. Teardown submitted.

However, with some earlier attempts with the same bulb, I flashed esphome using tuya-cloudcutter. I could not get the right config working with esphome and so would now like to re-flash it with OpenBK7231T. Unfortunately, I don't have any soldering skills so I need to do this OTA.

I can access the device using the "Fallback wifi hotspot" (192.168.4.1) and the via esphome server page. However when I try to use any of the firmware from the OpenBK7231T releases the flashing fails with:

"Update Failed: ard=8,uf2=2"

I'm presumed this means that the esphome requires the firmware to be in the uf2 format. So I tried running the running the OpenBK7231T_UG_1.15.454.bin file through a bin2uf2 converter without success, this time the esphome ota fails with:

"Update Failed: ard=11,uf2=3"

Should it in theory be possible to flash OpenBK7231T using the esphome OTA web service or is flashing to esphome a one-way street?

Does anyone have any suggestions on how I can convert/flash any of the OpenBK7231T releases using the esphome web service.

Thanks

On libretuya, convert the openbk.rbl firmware to .uf2 using lchiptool, then upload to your web server.

Thanks, unfortunately, I couldn't get that command to work.

I tried using "download;OpenBK.....rbl" and also "download;./OpenBK.....rbl" as per screenshot below.
I tried using sudo, but got the same Permission Denied.

Also does it matter that it's using bk7231n and not bk7231t?
I tried changing it to use bk7231t and it errors with "Family not found"



Added after 25 [minutes]:

I also tried


which returned

nealjka wrote:

Also does matter that it's using bk7231n and not bk7231t?

I'm not quite sure, but it's better to stick with the device type scheme (T or N)
Mostly just following the instruction posted by the dev, works well for me on windows

for bk7231t -> -f bk7231u

ltchiptool uf2 write -f bk7231u -b generic-bk7231t-qfn32-tuya -o openbkt.uf2 ';;download;OpenBK7231T_1.15.440.rbl'

ltchiptool uf2 info openbkt.uf2
I: Family: BK7231U / Beken 7231U/7231T
I: Tags:
I: - BOARD: generic-bk7231t-qfn32-tuya
I: - DEVICE_ID: 7b4bd984
I: - BUILD_DATE: 12ac1264
I: - OTA_VERSION: 01
I: - DEVICE: LibreTuya
I: - LT_HAS_OTA1: 00
I: - LT_HAS_OTA2: 01
I: - LT_PART_1:
I: - LT_PART_2: download
I: Data chunks: 1868
I: Total binary size: 478016

>>20448951
it's a bit late but it worked for me when I used ltchiptool from python. The syntax was python -m ltchiptool uf2 write -b cb2s -o openbkt.uf2 openBK7231N_1.12.50.rbl. The rbl file I had downloaded into the folder where I launched ltchiptool from.

I needed to flash a device with kickstart-bk7231n firmware with OpenBK7231N firmware. The command helped me:
python -m ltchiptool uf2 write -b cb2s -o openbkt.uf2 OpenBK7231N_1.17.135.rbl=device:download

I am trying to get one of my devices to OpenBK using the ltchiptool tool and I am not having any luck.
I always get this error:

Error: Invalid value for '-b' / '--board'

Not sure how to get past that error. Anyone have any idea?

Is there a T and N version of uf2 files around that one can download?

@p.kaczmarek2 - maybe it will be good to have some uf2 firmware on the GitHub as well? Not the latest version but some versions that users can download and upload so migration from LibreTiny is easier.

I've gone to the effort of converting BK7231T & BK7231N to .uf2 firmware. You can download the firmware from https://github.com/BenJamesAndo/OpenBeken_uf2_firmware

The trick was to add libretiny to the same folder as ltchiptool. More info here

Thank you so much for doing that, I couldn't get it to convert but your firmware saved the day!