hi mate
i was able to do them with tuya convert before they blocked em
have a look at this thread about the tywes1 chip
Tuya TYWE1S flash help - Hardware - Home Assistant Community (home-assistant.io)
have you tried the other rx/tx pair just in case they are using those
as the template for the zemi ones here, mention other gpio
Zemismart Blinds Controller Motor (YH002) Template for Tasmota (blakadder.com)
i think you only need gpio0 to gnd to get in to flash mode and not rst or anything