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If you don't want root, then don't root it; that's separate from replacing the ROM.

> there's no way to take full backups on Android phone, rooted or not

Er, no? On the contrary, root is exactly how you get full backups on Android - with, I grant, the exception of whatever Android calls their secure element / TPM, which I've only ever seen affect 2FA apps.

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yeah, good luck restoring full userdata and metadata partitions on a rooted pixel 4 and newer: you definitely can do that (and bypass TPM), but since there's no working twrp, there's no exactly easy way to dump/restore partition image with dd anymore.

? https://twrp.me/Devices/Google/ says there are official TWRP ports for pixel 4 and 5. I'm surprised at the lack of ports for newer versions; not sure what went wrong there. Yes, if you somehow get a phone without a working TWRP then you're going to have a bad time.

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