Nexus 9 stuck in boot loop - Nexus 9 Q&A, Help & Troubleshooting

For a good long while, I've been using SlimRom on my Nexus 9. Everything has been fine, I haven't been messing with anything on the device, just using it as normal. Just a short while ago, I powered it on, and it is now stuck in a boot loop. "Google" appears on the screen, then it goes black, and "Google" appears again.
If I do a volume down-power hold, I get to the HBOOT screen. Recovery option takes me to the TeamWin screen for a few seconds, then I'm right back at Google boot loop. Factory Reset option takes me to the teamwin screen briefly, then the boot loop again.
Any advice on a possible fix?

Flash stock rom (all data completely deleted)
http://www.wugfresh.com/nrt/
https://forum.xda-developers.com/showthread.php?t=1766475
( https://developers.google.com/android/images )
* https://forum.xda-developers.com/nexus-9/general/guide-how-to-unlock-bootloader-flash-t3035153

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Hi,
I've a Kindle Fire HD 7. I've installed on a cyanogenmad Rom there is a long time ago (maybe two years...). But I wanted to reset all to factory setting today.
I went to setting, and choose "reset factory system". But after the reboot, I saw the orange logo, after the blue logo, and the blue screen with the logo Teamwin on. The screen is flashing, but that all...
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Same issue!
Help please, it only shows teamwin logo time after time.

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