Reply to Midifighter 3D flash went wrong, only top right LED is flashing - need help ASAP

I'm on a gig and tried changing the firmware from my MidiFighter 3D back to the default one (had remix-deck FW before). The hotel had a login-start page and somehow the update process went wrong.

Now when I connect the MF3D only the top right LED flashes.

How can I reset it?
Need help ASAP as I will spin in a few hours and want to use it badly for my routines!