Solved: Any way to recover bricked WAP AC from remote

RouterOS General
1

Lesson learned today: I chained a CAP AC and WAP AC over PoE. CAPsMAN was configured to “suggest same version” update the firmware.
Now the first CAP updated, rebooted and interrupted PoE while the chained WAP was also updating.
The result is a briked WAP AC which I could netinstall but there are 1.800km between me and the WAP AC and no one could press any key.

Question: Any idea how to remotely recover the WAP AC?

2

Luky me: I installed a Linux netinstall-cli in the network and the WAP AC was in a state, that it network booted right after PoE reset.
WAP AC is recovered and online again.