thx for replying.

1. which firmware file?
2, I did hold the push button while powering up. Nothing seems to happen. (It all was correct on the old 8266 sonoff)

- Vincent

I do have a couple of problems flashing sonoff basic r2 power v1.0 a. It does not enter flashing mode (miniterm says bootmode(3,7) ) so I cannot flash it using usb->ttl (either from win10 or raspberry pi) b. one of the devices is complete dead, can I recover it? What am I doing wrong? Thx for respon...