http://www.androidauthority.com/nexus-5x-android-7-nougat-bootloop-issue-717698/
https://www.google.com/#newwindow=1&safe=off&q=nexus%20bootloop
We understand that a very small number of users are experiencing a bootloop issue on the Nexus 5X. We are continuing to investigate the situation, but can confirm that this is strictly a hardware related issue. For those of you that are currently experiencing this, please contact your place of purchase for warranty or repair options.
We’re sorry for the inconvenience and appreciate your continued patience.
在中国用 Nexus 没什么安全感:(
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