Quote:
Originally Posted by kreti
Firmware update remove and update the system partition. Your apps and data will remain, although it is possible that you must reinstall some of the apps. The books, or another data you copy in flash drive remain there.
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I'd recommend a backup, in any way. Going from the original firmware to 1.7.2, after the upgrade google play services kept crashing, making the device unusable until I did a factory reset, and the same thing happened with 1.7.2 to 1.7.3. Luckyly this time I had titanium backup so I could get back up and running fast.