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I think that the device may have lost power during a system update and it now won't boot. It sticks in a reboot loop.

Can I re-flash it easily? I suspect the firmware is broken.

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I would try -- what do you have to lose? If you have a custom recovery on it, you could also try wiping the Dalvik cache. And if nothing from both helps, a factory reset might do (beware this deletes all your data and apps, too). –  Izzy Mar 18 '13 at 8:41
    
Izzy - How would I do those things? I'm not familiar with the procedure. I can get to the boot loader but nothing else. –  Daenyth Mar 18 '13 at 14:03
    
How did you do it in the first place? Was it an OTA, or did you manually flash an update.zip? I never applied any OTA, but if it did not complete, the downloaded update.zip (if the OTA used this way) might still be present. I would first check its time stamp (e.g. via adb shell), and if that matches, simply re-apply it via the recovery menu. Maybe a Nexus One user can give you better advice. –  Izzy Mar 18 '13 at 14:33
    
@Izzy: I wasn't the one using the phone at the time but it would definitely have been an OTA. –  Daenyth Mar 18 '13 at 15:01
    
Is the phone rooted? Does it have custom Recovery installed? Stock or custom ROM (like CyanogenMod)? –  Chahk Mar 18 '13 at 15:54
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