It is stuck on EXCEPTION error when booting up, can’t do anything… I even can’t Update OS, when sending sysex via Transfer (recovery mode) via MIDI, I see on screen READY TO RECEIVE but nothing happens. In the TEST MODE there are 0 errors.
What to do?
First, turn it off. Unplug the power supply and then wait a few minutes before you re-insert the power supply and turn it back on. Sometimes, this is helpful.