I have just bought 3 new Sonoff T1’s (wall light switches), I cranked up drzz’s tutorial to do SonOTA flashing with Tasmota, but after SonOTA failed to start step3 some investigating found out that later firmware 2.7.1 doesn’t support OTA anymore as it is insecure which has left me on witch hunt for hardwire flashing, with not much luck as to how to go about it!
The articles I have come across are all for the older gen1 version of the T1 but alot has been updated on the new T1’s since then (worth noting that the Touch is the first model with the black backplate, T1 is the revamped version) and no one seems to have written much about it.
This article on github is the only one I have seen my circuit board and says OTA can be done easily (article must have been written before firmware updates or they just assuming it worked with this model)
I have soldered wire to 3.3v, gnd, tx and rx and was using ESP Easy Flasher, I know on Sonoff basics I had to hold the on/off button and disconnect/reconnect 3.3v whilst hold it down to enter flash mode. As there is no article for the new T1 I though I would try to just hit the flash button and push 6.2.1 tasmota, but then I stopped myself coz these switches aren’t cheap and I don’t want to brick.
Any help would be much appreciated.
ps here is article for flashing older version