@MookieDog
Finally!
I followed MookieDogs's instructions and was able to recover my Omega2+.
In short:
- solder RX0 and TX0 on PowerDock to extend Omega2+ serial0 (console serial) RX and TX lines
- cross connect RX0 and TX0 line with respective TX and RX on 3.3v level serial port. I used Raspberry PI serial and minicom.
- on Raspberry PI (or another Omega) use serial port with "minicom -b 115200 -D /dev/ttyAMA0" command
- now you are able to connect to Omega2+ console and configured it as you wish. I did manual factory reset using info on https://docs.onion.io/omega2-docs/factory-reset.html
All thanks go to MookieDog.