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System update


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I own smart phone Acer Z130 with Android 4.2.2.

I have recently received a prompt to download and install system update.

For now, everything is working more or less ok. My questions are:

1) What the system update will update? The ROM? The kernel?
2) What and how I can backup the things that are going to change, so that I could get back to the previous state of things in case I don't like the update?


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