Hi, I've actually the same issue with an electrical plug. Got the same Failed to read device MID!. I attach the first dump for this device with a few pictures. It seems I've been able to write the h118ffb first byte with hid_download correctly compared to your last firmware but no hotspot once...

Name: CB2S with BK7231T? Failed to read device MID - wrong WiFi module label?
Uploaded: 2023-05-27T21:45:36+02:00
Description: Hi, I've actually the same issue with an electrical plug. Got the same Failed to read device MID!. I attach the first dump for this device with a few pictures. It seems I've been able to write the h118ffb first byte with hid_download correctly compared to your last firmware but no hotspot once...

EDIT: Wait, I can see the problem! What a strange issue! You have BK7231T marked as CB2S, but CB2S should be BK7231N! Try using BK7231T mode. It's not the first time they have swapped chips/markings! Old reply below Hello, hid_download_py at least should work, if it's not working, then maybe you do not provide enough power for the device or maybe wires are too long. Or you need another USB to UART converter. Make sure that hid_download_py commands are correct, see our tutorial: What is the model name of your device? Here's extracted config from the binary: Code: JSONLog in, to see the code Added after 28 :Your firmware dump also identifies as WB2S/BK7231T:

Hi, You have lynx eyes mate !! It works fine with T firmware. Thank you very much.

I've already seen similiar swap, with BK7231N on WB2S module, so I know what to watch for. Good job on getting OpenBK7231 working!

I have four similar plugs, bought as a bundle. Two had swapped pin markings, two had correct ones. Crazy.

Usually the quality control catches that kind of faulty boards even before the elements are soldered, but it seems that people at Tuya product factories may just don't care or don't want to waste any boards... Added after 1 [minutes]: I can quote my old message:

CB2S with BK7231T? Failed to read device MID - wrong WiFi module label?

viandoxone 2205 5

Reply | New topic

#1 20596683 27 May 2023 21:10

viandoxone viandoxone

Level 2
Post #1
20596683 27 May 2023 21:10

Hi,
I've actually the same issue with an electrical plug. Got the same "Failed to read device MID!".

I attach the first dump for this device with a few pictures.

It seems I've been able to write the h118ffb first byte with hid_download correctly compared to your last firmware but no hotspot once this one started. I am also unable to use the "Unprotect" option.

Cheers,

CCX

Attachments:

readResult_BK7231N_QIO_dump_2023-27-5--15-16-38.bin Download (2 MB)
ADVERTISEMENT
#2 20596729 27 May 2023 21:45

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

Helpful post? (0)

Post #2
20596729 27 May 2023 21:45

EDIT: Wait, I can see the problem! What a strange issue! You have BK7231T marked as CB2S, but CB2S should be BK7231N! Try using BK7231T mode. It's not the first time they have swapped chips/markings!

Old reply below
Hello, hid_download_py at least should work, if it's not working, then maybe you do not provide enough power for the device or maybe wires are too long. Or you need another USB to UART converter.
Make sure that hid_download_py commands are correct, see our tutorial:

What is the model name of your device?
Here's extracted config from the binary:
Quote:

Device configuration, as extracted from Tuya:
- Button (channel 1) on P7
- LED (channel 1) on P6
- WiFi LED on P26
- Relay (channel 1) on P8
Device seems to be using WB2S module, which is using BK7231T.
And the Tuya section starts, as usual, at 2023424

Code: JSON
Log in, to see the code

Added after 28 [seconds]:

Your firmware dump also identifies as WB2S/BK7231T:

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
ADVERTISEMENT
#3 20598516 29 May 2023 12:19

viandoxone viandoxone

Level 2

Topic author Helpful post? (0)

Post #3
20598516 29 May 2023 12:19

Hi,

You have lynx eyes mate !!

It works fine with T firmware.

Thank you very much.
ADVERTISEMENT
#4 20598521 29 May 2023 12:22

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

Helpful post? (0)

Post #4
20598521 29 May 2023 12:22

I've already seen similiar swap, with BK7231N on WB2S module, so I know what to watch for. Good job on getting OpenBK7231 working!

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
ADVERTISEMENT
#5 21438415 13 Feb 2025 20:38

andraskszabo andraskszabo

Level 4

Helpful post? (0)

Post #5
21438415 13 Feb 2025 20:38

I have four similar plugs, bought as a bundle. Two had swapped pin markings, two had correct ones. Crazy.
#6 21438589 13 Feb 2025 22:42

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

Helpful post? (0)

Post #6
21438589 13 Feb 2025 22:42

Usually the quality control catches that kind of faulty boards even before the elements are soldered, but it seems that people at Tuya product factories may just don't care or don't want to waste any boards...

Added after 1 [minutes]:

I can quote my old message:
p.kaczmarek2 wrote:
You are connecting your wires incorrectly.
I had this module.
It has misleading silkscreen. The 3.3V and GND are not where you think they are.
Please double check with your PCB.
I think the real 3.3V and GND pads are as shown here:

Your module has mixed pad markings and they are misleading. Again, please double check, but I already had module looking exactly like yours and I flashed it the way like I would flash old CB2S...

Added after 1 [minutes]:

PS: To be honest, when you look at the pin marked as "P24", you can see it's really a ground pour plane:

So I think my idea checks out.

Please connect it correctly and flash with our tool: https://github.com/openshwprojects/BK7231GUIFlashTool

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
Create an account, log in and become active in a forum and ads will not appear. You will receive points by participating in discussions.
Join this discussion.

Install the application

Didn't find an answer? Ask Artificial Intelligence

*I agree to send the question to OpenAI, Anthropic PBC, Perplexity AI, Inc., Kagi Inc., Google LLC - owners of language models in order to prepare the best response. The companies may monitor and log information entered into the form.

*I agree to publicly display my question and answer. The question and answer will be publicly available to everyone. The process may take a few minutes. Upon completion, you will be redirected to the page with the answer.

Wait...(2min)