Try disconnecting the battery - just ribbon cables - press power button to discharge power. Reconnect ribbon cables and try to get into Safe Mode - holding down Volume Down when rebooting - to disable third party apps.
Nexus 9 Battery Replacement
Does it still loop?
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Using ADB to transfer files from an Android phone or Tablet to a PC
This guide shows you how to easily install the Android SDK (Software Development Kit):
https://www.androidauthority.com/how-to-...
How to setup ADB:
https://www.androidauthority.com/about-a...
https://www.androidauthority.com/android...
Note: Normally if USB Debug is not set up on your phone ADB will not be able to see and transfer files. However you wife's tablet may have MTP mode (MTP stands for “Media Transfer Protocol.” This connection mode is more universal in comparison to ADB since it allows connecting not solely Android devices, but many other ones as well, like mp3 players or digital cameras). MTP rather than exposing your Android device's raw file system to Windows, MTP operates at the file level.
You know this is a very technical problem and I can't just tell you what to do off the top of my head. It take either a lot of experience with Android devices or the interest to explorer and not give up.
You could experiment with Mount /system: This gives access to core files and folders that are usually inaccessible. You can mount a partition to view data and edit it.
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(Duplicate question, see Nexus keeps trying to start shows the google start up and then nothin) Does your device charge? Apparently this could also be a battery issue, so first I would try following what S W suggests in his post (get in fastboot mode and see if the tablet stays on for at least 2 hours) to rule out a hardware problem, then we'll see if booting a custom recovery could come to rescue before factory resetting.
von Simone
It seems to charge okay. I currently have it in what I guess is fastboot mode, I don't know how to share images here, but the text on the screen says:
Device State - LOCKED
FLOUNDER PVT SHIP
HBOOT-3.50.0.0143
0S-n/a
eMMC-boot 2048MB
Feb 6 2017,18:13:20
FASTBOOT
<VOL UP> to previous item
<VOL DOWN> to next item
<POWER> to select item
HBOOT
REBOOT
REBOOT FASTBOOT
POWER DOWN
I've been on this screen for about half an hour so far, I guess I'll keep it like this until 2 hours have passed and report back.
von trevorinchmale
Ten minutes after my last post, the tablet switched off, though I'd been pressing the volume buttons regularly. Then it wouldn't come back on. Maybe it just didn't have much charge left and I didn't know. I plugged in the charger lead and now it's charging. I guess I should give it plenty of time to charge (an hour or more?) and then try the fastboot thing again.
von trevorinchmale
Yes, ideally battery should be indicated as fully charged; give it some time to charge before trying again, also make sure you're using an original or good quality charger+cable and plug it to a known to work power outlet
von Simone
If you have USB debug enabled on your Nexus you could also check battery state from your PC, here you can find out how: https://pinoytechsaga.blogspot.com/2021/...
von Simone
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