Flashing OpenBK7231N Firmware on BSEED 1G Wall Switch (T34 Tuya Module)

After a lot of research, I didn't find much information about BSEED wall switches (T34 module).



But this community/forum has a lot of people who contribute a lot of accurate information and so I was able to flash the openbenken firmware on these devices.

I leave the steps below:



The image shows a 3G switch, but the pins are the same (1G, 2G, 3G, Curtain), above 1G you have to lift the button, it is glued, to access the Rx and Tx Pins (P10 P11).

If you have issues, please swap Rx/Tx connections


1. Open BK7231Flasher e select your com Port.

2. Select your BIN file (BK7231N) and flash.

3. When it shows that it's waiting for CEN, remove the 3,3V jumper cable and then reconnect. (without removing the TTL Serial adapter from USB)

4. The flash should start and after about 20 secs it's finished.


Module Configuration

I'm very happy to see that this T34 (BK7231N) device has flashing pads available on the board. We already have seen devices with T34 without routed out pads, and they were very hard to flash:
[BK7231N / T34 ] Teardown Tuya Generic Wifi Wall Light Switch 3 Gang

Are you able to determine the exact model of your switch? Or, at least, where it was bought?

>>21103721

There is no model name, I bought directly from BSSED.com

Added after 3 [minutes]:

>>21103721
I've already bought hundreds of them, they don't always come with the T34 chip, most of them come with the WB3S-IPEX.

I've never felt the need to use it outside of the Tuya cloud, but right now it's what makes the most sense.

Thank you to the entire community for your effort in helping.

I've just received a T34/BSEED look-alike wall switch, and I noticed that this device isn't listed in the device list. It doesn't appear as a BSEED branded product or under any other name.

These exact pin assignments are not seen against another device



and so
https://github.com/OpenBekenIOT/webapp/pull/124

@divadiow so you got T34 now?

Aye

https://www.elektroda.com/rtvforum/topic4036975-60.html#21117203

I just bought a similar looking switch, but it seems they use another PCB, which makes life a bit easier. It uses a CBU module.

BSEED Smart Light Switch, Single... https://www.amazon.de/dp/B07PQGFZ36?ref=ppx_pop_mob_ap_share

No need to tear off the white pad on T34. You will kill the touch-functionality.
You can prick with a needle from the backside of the circuit board into the corresponding soldering eyes for RX/TX.


I flashed multiple of them this week, without any soldering.
I got a mix of the CBU and T34 versions delivered. The config needs to be different, as they are using different pins for the relay and the binary sensors.

T34 Board is labelled: TW2-0003A
CBU board is labelled: TW2-0083A

Both are doing the exact same job.

And no need to solder 3.3V/GND. You can use jumper cables on the existing pins. That's where they get their power from:

T34:


CBU:


If you have a problem providing stable 3.3V and you don't have a good power supply, you can use the bottom part of the switches and grab 3.3V and GND from there:

That's CBU version's bottom part, but it will work the same way for T34 version. You just need to pick the right pins corresponding to my picture above:
(Pay attention, what you're touching here. Parts might be on 230V!)