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The easiest is to keep MCU disabled is by identifying the NRST/RST (Reset) pin of the MCU from its datasheet and connect it to GND for the entire flashing process. This will keep MCU disabled while you flash TYWE3S. If there are some contacts or test points in switches that connect to the MCU, you might be lucky to find contacts for RST that you can easily solder onto.
Pictures
Tracing
Configuring
https://templates.blakadder.com/treatlife_DS01.html
References
| Reference | URL |
|---|---|
| Tasmota - Tuya MCU Devices | https://tasmota.github.io/docs/TuyaMCU-Devices/ |
| Tasmota - TuyaMCU | https://tasmota.github.io/docs/TuyaMCU/ |
| Tasmota - TuyaMCU Protocol | https://tasmota.github.io/docs/TuyaMCU/#tuya-protocols |
| Tasmota Rules | https://tasmota.github.io/docs/Rules/ |
Trying to flash tasmota on TYWE3S #5377 | https://github.com/arendst/Tasmota/issues/5377 |
| Configuring Tasmota on DS01 | https://templates.blakadder.com/treatlife_DS01.html |