I’ve now installed the latest OS manually - my FP2 is working again! No data lost.
At first I kept getting the warning “No Fairphone 2 found in fastboot mode”. Then I downloaded & extracted the ZIP archive again, and this time it went fine.
See https://support.fairphone.com/hc/en-us/articles/207914363
In the mean time I’ve learned about recovery etc, and I’ll make sure to make backups …
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