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    Thread "Failed to unmount '/data' (Device or resource busy)" What does that mean?

    Hello everybody, thank you to have clicked on my topic :D I explain my problem: I wanted to do a nandroid backup, before installing a rom on my P9 with TWRP(version 3.1.1-0), I have selected "Boot," "System," and "Data" (as usual) But a message appeared: "Failed to unmount '/data' (Device or...