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オリジナル投稿者: S W ,

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If you have charged it all the way, and it still fails to try to get past the Nexus logo, it could be a battery issue.

To test this issue, see if you can get into "Fastboot Mode" and see how long it stays there.

• First, you have to turn off your device – perform a complete shut down sequence, don’t just reboot your tablet (press Power button and select “power off” or press and hold power key for a few seconds).

• Then, in order to enter fastboot mode on your Nexus 9 you need to press Power, Volume Up and Home buttons at the same time.

• Keep pressing these keys until fastboot mode is being displayed on your device.

• The START option should be listed in the upper part of your screen.

Now, if it goes at least 2 hours without powering off (you may need to touch the Vol buttons once in a while to make sure the tablet doesn't restart or simply goes into power save), you have a software issue.

To resolve a software issue, please be aware that your data likely will be erased.

• if you don't have LTE on the tablet, download https://developers.google.com/android/images#volantis

• if you do have the LTE version, download https://developers.google.com/android/images#volantisg

NOTE: Download the last one on the list only, you don't have to download everything.

Follow these instructions to install adb.

https://forum.xda-developers.com/showthread.php?t=2588979

Follow these instructions to unlock the booloader from fastboot mode only.  Don't do anything else here.

http://forum.xda-developers.com/showthread.php?t=2507905

Finally install the large firmware package with these directions using the directions here:

https://forum.xda-developers.com/google-nexus-5/general/tutorial-how-to-flash-factory-image-t2513701

NOTE: Start at "Flashing Factory Images".

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