On that page it shows that re-flashing with tasmota is possible with Tuya-convert. I’ve always had mixed success with Tuya-convert but this time I am a bit stumped as I haven’t been able to put the dimmer switch OTA upgrade mode.
Just wondering if anyone here has flashed a HGZB-04D wifi dimmer switch and if so, what did you do to get it into upgrade mode? (LED flashing quickly).
Ground the correct pins to put it into flashing mode
To get it into flashing mode you have to connect it all to the external FTDI (I use the FTDI FT232.
Then you need to ground the GPIO Pin0 on the TYWE3S to ground, keep this connected until the end
Then you need to ground the RST pin from the 8s003f3p6 as well, this stops the MCU from taking over the TX/RX pins. You will notice that when you power the FTDI, all the LED’s will come on, when you ground the RST pin, only the middle LED will be on, but dim. I just held it there with some clips during the flashing process.
Once all this is done, you can go ahead and flash Tasmota as per the instructions.
I’m at work right now but when I get home I’ll put a photo instruction set up on GitHub.