Thanks for posting the solution with the top left button!
I had the same problem, and the trick with pressing top left button at reset helped me.
I have not found this trick in the documentation, actually it has no section for problems/solutions or similar.
It could probably be documented somewere in the docs then just in the forum - maybe the documentation and/or the FAQ could have a list with troubleshooting / rescue commands.
That would have saved my trying to reset/reinstall the 3.5 Firmware 5 times