If you own a Nexus 5 or Nexus 7 device and have not updated to any version of Android 5.0.X Lollipop yet, don’t hit the update button or attempt to flash it. Multiple users of these two Nexus devices are reporting that any Android 5.0.X Lollipop update is bricking their device. It appears the Android 5.0.2 update is the most problematic one, so you might want to steer clear of it.
https://twitter.com/eric_winkler/status/586767671686991872
This issue seems to affect the Nexus 7 (both 2012 and 2013 models) more than the Nexus 5. In any case, many are saying that Android 5.0.2 Lollipop update is the one that is bricking their device. Interestingly, some users have even reported that their Nexus 5 is bricked after updating it to Android 5.1 Lollipop, although these users seem to be in the minority.
To make matters worse, Google doesn’t seem to be taking any action to rectify this issue yet. Some users were advised by repair shops to have their device’s entire logic board replaced in order to rectify the issue, although it seems like they are trying to take advantage of the situation as more tech-savvy users have managed to solve this issue without any hardware fix.
Hopefully, this isn’t a hardware problem. Not only is it much more troublesome to fix than a software issue, it would also be frustrating to owners who have an expired warranty. In any case, we’d advise owners of the Nexus 5 and especially the Nexus 7 to not update to any version of Android 5.0.X Lollipop.
(Source: 9to5Google)
