Unfortunately these devices run the new Tuya firmware, which prevents using OTA tuya-convert to flash Tasmota or ESPHome.
Once you have separated the sides, insert a the spatula just under the step a lift up. The corners can be a bit stubborn. Release both sides before trying to separate fully.
My favourite is the iSesamo from mymagmat.com, but you can find similar on ebay for half the price.
ISesamo - Ebay
Only method available is serial. The TYWE2S IO can be accessed after unscrewing the PCB and separating the backplate. There is sufficient cable length to gain access.
Please see the other blog posts for flashing process.