My Nano was just working fine until I did terrible thing ie put 20v supply to +5V pin for several seconds. And then codes inside seems not working anymore, then connect to PC and try upload new codes from IDE but I got
" avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x5b
avrdude: stk500_recv(): programmer is not responding "
- Physically look normal nothing burn smell normal too.
- When connected to PC USB or external power supply through mni USB, power led is on, +5V pin measured 4.6V and +3.3v pin measured 3.3v. My codes inside use d8 and d12 as input_pullup so I check d12 measured 4.6V (seems ok) but d8 only 1.6v (like any not used digital input).
Is that means my Nano already broken? any posibility to be recovered?