Tasmota - revert to original Sonoff firmware?

Hi, is it possible to revert from Tasmota to original Sonoff firmware? I have a TH10 with AM2301 sensor that worked perfectly prior to flashing Tasmota but doesn’t work at all now. It definitely looks like a software issue and I’d like to try fixing it with reverting to original Sonoff FW. How would I do it?