Uploading OpenBK software to MOES BHT-002-GCLW v4 thermostat with TUYA CB3S BK7231N chip

Yes. Just the Tuya firmware backup. If you're worried your files might contain WiFi credentials feel free to send to me directly. I can reset/sanitise with test network credentials.

Can firmware-sized attachments be sent in a private message or are they too large ?

Yes, why not? I've tested it. Attachments are working well on our forum. And we even have our own image hosting! Don't forget that.

thank you for sending me the CB3S and WB3S Tuya firmware backup files

Here's some info from them, might not be anything new. Your files attached but reset and only my test credentials might be in them.

Tuya product name: 柏益温控器（采暖） (Baiyi Thermostat (Heating))


CB3S

WB3S

Tuya product name: NH-HG-温控GBGCGA (NH-HG-Temperature Control GBGCGA)






The only difference between the two sets is the name for dpID 101.

>>21141019 Hello, did you manage to install OBK?

>>20744701

Probably a stupid question, but here goes: when you say you soldered out the two components marked in red, does that mean you simply removed them completely or did you create the connection directly without the resistors (?) in between? I read in one of the later posts by someone else that you desoldered and bridged them, hence the confusion.

Additionally, I understood that you ended up resoldering these - am I correct in assuming they need to be desoldered for the firmware flash, but once flashed they can (and should be) put back in place? And if they need to be put back, does it matter which side is which? The components are not marked so I honestly have no idea which side was where anymore.

For some additional context: I have the same exact PCB/Layout as your original post, and am trying to replicate your success with OpenBK. My first step was attempting to dump the existing firmware. I've gotten to the point where I desoldered these components, since I didn't get any output before doing so. Afterwards, I am able to use both the hid_download_py tool and the BK7231GUIFlashTool (albeit with mono) to attempt to dump the original firmware. However, both tools have issues with reading the chip properly, hid_download_py explicitly gives CRC errors, and the backup in the GUI tool just gives failed. So at this point I wonder if it's my soldering, my toolset (running the above tools in an Ubuntu VM on an M1 MacBook...) or my understanding of what needs to happen. Any help would be appreciated: I have 5 of these and would like to get them all integrated with HA. Thanks in advance.

mvz0209 wrote:

Code: text Expand Select all Copy to clipboard

alias FaltHeartbeats backlog setChannel 0 1; addChannel 10 1; delay_s 2; setChannel 0 0
addChangeHandler MissedHeartbeats > 4 FaltHeartbeats

Please note that delay_s in backlog will work only in OBK builds later than 2025.06.19. It was not supported before. It should work now.

I have several MOES thermostats with wb3s board. I use ESPHome, and find a big problem, which is not fixed already several years.
tuya chip is going to be hot, as result i need to set my offset to +8 degree (default: +3, max: +9). And it's works this way. when device is off for several hour, then you turn it on, temperature shows OK. but in 15 minutes chip is hot. and even one device with some of firmware was so hot, as I can see in on LCD display.
Another problem, device is hung once 2-3 days. the reason when I debug, send and receive data on a same time.
as i can see a solution to fix, is not to send/receive on a same time, and have something like protection, next to not continuously receive data from tuya, but do it once 60 secs, for example. as for now it's every 1 second.
in ESPhome I don't have this possibility.
p.s. datapoint 104 is not functional, always return same value "ON".

If you want a custom feature, then I can write a driver for you, but that's obviously for OBK only. We have ability to run OBK on Windows with Simulator so it's very easy to do

it's a tuya, not a driver i assume.

Try OBK powersave 1 for chip heating. By chip, you mean WiFi module?

OBK has TuyaMCU queue option, and if not, we can try to use heartbeats missed event to reset it

By dp 104 not functional, do you mean that it does not work in Tuya as well?

>>21584726 dp 104 is always with status "ON", does not change, even when heating or not.

I do not know this particular device. Can you change dpID 104 from Tuya firmware?