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Device: Nexus 7
Android: 4.2.2

Can I upgrade my Nexus 7 to 4.3 via OTA, then re-root without losing data? I used a procedure of this sort to root originally, but I don't know if it is generally possible.

Note: I did not unlock the bootloader when I last rooted.

2

NO.

Updating from 4.2.2 to 4.3 will retain your data, but this will make you lose root. To root, you would need to unlock the bootloader, which will almost always require a Factory Reset (thus, you lose your data).

So, I suggest to back-up your user apps and data with Titanium Backup or something similar.

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