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[Stefan]

Welcome to the forum, @felitas!

@felitas

The screen turned to black, it’s still possible to enter fastboot mode, but the flash script hangs after verification. So I’m grateful that there are fairphoneangels and will contact them for help.

Edit: I see that you found a solution:

Can not go back from fairphone Open to Fairphone OS

Problem solved: the unix script must be run as root. It wood be good to change the Manual Install guide accordingly. I am much obliged to #fairphoneangels, esp. @explit