Testing wifi so far…
Restarted duet 10 times, 5 worked, 5 failed (50% of the time...).
Interestingly, 1 fails, 1 works, always doing more or less the same (turn on, wait until connects or fails, wait ~20s, turn off, wait ~10s, turn on...). At least, works more often than before...
I moved back to 1.19.2 (both, firmware and wifi), and repeated the testing 6 times: 100% connection success
It shows "Connected", then "Wifi Module Started" (this is not shown in 1.20), then "Wifi Module connected to Access point" (ping start answering), then 5 seconds after this, ping start to fail, and screen shows "Error retrieving wifi status message" and then connects again with "Wifi Module connected to access point" and don't fail anymore. After the third reboot, "Error retrieving wifi status message" didn't show again, and wifi works perfectly fine.
Moved to 1.21RC1 and again, one works, one fails... so I don't think this is hw related :S
Can I give you anything else for diagnostics?
Regards