Restoring TWRP Backup fails (Error 255) on a Xiaomi Mi9T

This is rather a forum for Fairphone owners.

You could try formatting the phone as said in this topic: 🇬🇧 🇩🇪 ✏ Installing the Fairphone 2 from scratch in case of failure / Komplette Neuinstallation des Fairphone 2 im Fehlerfall, at the end, in the addendum.

See this part

Or just wipe the phone through advanced wipe and then format data.

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