It's not. Get a usb-serial cable. Open it up, attach that, load Tasmota firmware. Takes a little bit of fiddling to figure out which gpio goes to which relay so

It's not. Get a usb-serial cable. Open it up, attach that, load Tasmota firmware. Takes a little bit of fiddling to figure out which gpio goes to which relay sometimes, but once you've gotten the pattern you can upload it so others don't have to figure it out next time.