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I was about to flash the phome with the command prompt, but an error came up saying that the device was locked. Does this mean is has to be rooted? If I root it and upgrade it will it be unrooted again because I don't want to loose my warranty.

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  • What phone? And are you installing an official factory image or a custom ROM?
    – Wyzard
    Commented Jun 27, 2014 at 23:09
  • The nexus 5. I'm installing the android l developers preview Commented Jun 27, 2014 at 23:15
  • I'd expect that to work even with a locked bootloader, since it's an official image, but I haven't tried it so maybe I'm wrong.
    – Wyzard
    Commented Jun 27, 2014 at 23:28
  • unfortunately it does not Commented Jun 27, 2014 at 23:32

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It sounds like your bootloader is locked, which is different from rooting. With a locked bootloader, you can only flash official signed factory images; with it unlocked, you can flash anything to any partition.

If you're following Google's directions for installing factory images, you'll see that one of the steps is to run a fastboot oem unlock command. This unlocks the phone's bootloader. It also erases all your data. (But installing the L Preview system image will do that anyway.)

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  • so it does not root the phone. Thanks bud unfortunately I cannot vote you up because I'm still new and have no reputation points :( Commented Jun 27, 2014 at 23:40
  • It doesn't root the phone, but it does void your warranty — or at least, it displays a message saying that it voids your warranty. (But again, installing the L Preview system image will do that anyway.) And it's possible to re-lock and flash back to a supported factory image later, leaving no trace that it's ever been unlocked.
    – Wyzard
    Commented Jun 27, 2014 at 23:48

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