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Hi everyone. I have a friend's Redmi 3 device with locked bootloader (not sure but most possible). Device starts fine but soon screen goes black and becomes unresponsive. Pull down menu works sometimes. I can go to settings, but screen goes black almost immediately so I can't enable developer...

I understand that flashing TWRP or any other custom recovery voids warranty. My question is, can I install a custom e.g. EU rom without permanently flashing TWRP? Thus, if my phone has a hardware problem like a disfunctioning camera or microphone etc., to be able to flash back an official ROM...