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I'm new to phones. I have a Nexus 5. When Android 5 came out I got it fairly soon. I had read forums with advice on installing so I backed up my contacts and apps, updated, and then did a factory restore. I've gone happily through 5.0, 5.0.1, and now 5.1.
When I restored my data I lost one contact and had to reinstall two apps that I'd bought and needed keycodes entered. I don't have hundreds of apps and it just wasn't a big deal.
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