Yesterday I updated from this snapshot version 2016-04-18 17:30:08 to the last one 2016-08-20 00:21:07 (bullhead)
Everything looks in its place, but yesterday the device was keeping restarting, today it's stable.
I tried to reboot it by myself and when boot it says:
There’s an internal problem with your device. Contact your manufacturer for details.
Any solution?
I have found a soulution here but it's for Nexus 6P and Android 5.1 but I think it will work in your case as well.
Android System
There's an internal problem with your device. Contact your manufacturer for details.
The problem occurs because of a check that Google implemented in Android 5.1 (and it seems stayed in after) which compares /system/build.prop with the values found in /vendor/build.prop.
If they differ you get that error message. All one has to do to get rid of the error is to change the 3 values in /vendor/build.prop according to the values in /system/build.prop.
On the link you can find a flashable zip. The magic is in the update-binary file:
/sbin/busybox egrep "^ro\.build\.(date(\.utc)?|fingerprint)=" /system/build.prop \
| /sbin/busybox sed -e"s/^ro\./ro.vendor./" \
> /vendor/build.prop
So you need:
TWRP on your devicevendor-build-prop-fix-signed.zip to your devicereboot into recovery modeIf it's not work (but it should be work), you can try this method.
It says you should download and flash/install the vendor.img which matches your ROM's base.
Q & A