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

I have been trying to update to the newest version of Lolipop for the nexus 9 and so I tried to flash the stock image. While flashing the the system.img fastboot hung and forced quit. The tablet now rebooted to the google screen and wont boot up any help is appreciated!!
I got it to boot into bootloader and just reflashed stock and this time it worked. Getting it into bootloader was tricky for some reason it wasnt letting me in for a while! I had to unplug it and hold the power button and last second push volume up,

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Boot loop - unable to boot to recovery

Interesting thing happened today which has basically put my phone in a death spiral state. The battery died and after charging it a while I went to power it back on and found it in a boot loop state. I can get into the bootloader, but from there if I select recovery it reboots and the white bar on the right side of the screen fails to fill up, then the phone reboots. I've tried flashing two different versions of TWRP from the bootloader and it still exhibits the same issue.
HBOOT 1.12.1111
RADIO 1.12.11.1210
S-OFF
I was running CM10.1 without much issue until the power issue.
Any thoughts?
Thanks to Zanzibar for helping me work through this on IRC. Eventually the steps outlined here: http://forum.xda-developers.com/showthread.php?t=2338391&highlight=boot+loop did the trick.
fastboot erase cache
fastboot reboot
The device started booting but hung on the CM logo for far too long. I hard rebooted and installed an updated version of TWRP and then wiped and flashed the ROM over again. More updates to follow.
Well the device worked for the night but when I rebooted it this morning it immediately began the boot loop situation again. I RUU'd once and it got stuck in another boot loop. I got it to boot after hard powering down and it loaded the factory ROM. I rebooted back to the bootloader and flashed TWRP 2.5.0.0 and tried to reboot. Another boot loop. Hard power cycling didn't solve it either, so I pushed the RUU for a second time. Now the device refuses to boot into anything other than the boot loader -- the initial issue from this post -- and no amount of hard power cycling makes a difference.
The phone is currently showing as LOCKED in the boot loader so I dropped it off at the Sprint store to see if they could find anything physically wrong etc. More updates as they are discovered in the hopes that if someone else ever experiences this, they have something to reference.
Thanks for posting. Did you solve the problem? I think I'm having something similar.

[Q] HTC one bricked. Please help.

Hello I believe my HTC one is bricked. I was changing my ROM, I have done it before but its been awhile so I did it wrong and bricked it. This is what I know.
When putting in the new ROM it showed an error and I realized I forgot to clear the data and cache. So I went back into my recovery to clear the cache and I did a factory reset.
Then it started to boot loop. It would boot to my boot screen, turn off, then boot up to my recovery, show the recovery's logo screen for a very short period then turn off and go back to the HTC boot screen.
I held down the power button and volume down and managed to get to my boot loader from there I did another factory reset because I thought it would go back to stock.
I attempted an RUU to no avail.
All of that got me to where I am now. I can boot to to my boot loader and recovery. I have full access of my teamwin recovery and my boot loader. My recovery says I have no OS every time I reboot. I am not in USB debugging mode and only have access to fastboot from my computer.
I really think I just need a nuclear option to set it back to. %100 stock using only fastboot. My last resort is going into the att store and play dumb.
xeas said:
Hello I believe my HTC one is bricked. I was changing my ROM, I have done it before but its been awhile so I did it wrong and bricked it. This is what I know.
When putting in the new ROM it showed an error and I realized I forgot to clear the data and cache. So I went back into my recovery to clear the cache and I did a factory reset.
Then it started to boot loop. It would boot to my boot screen, turn off, then boot up to my recovery, show the recovery's logo screen for a very short period then turn off and go back to the HTC boot screen.
I held down the power button and volume down and managed to get to my boot loader from there I did another factory reset because I thought it would go back to stock.
I attempted an RUU to no avail.
All of that got me to where I am now. I can boot to to my boot loader and recovery. I have full access of my teamwin recovery and my boot loader. My recovery says I have no OS every time I reboot. I am not in USB debugging mode and only have access to fastboot from my computer.
I really think I just need a nuclear option to set it back to. %100 stock using only fastboot. My last resort is going into the att store and play dumb.
Click to expand...
Click to collapse
you can boot to recovery
choose advanced/sideload
then from your pc put the rom you want to push to the phone in the adb/fastboot folder
then
adb devices
(verify you phone are detect)
adb sideload name_of_the_rom_file.zip
(Wait the file is transfered to phone and recovery flash)
clsA said:
you can boot to recovery
choose advanced/sideload
then from your pc put the rom you want to push to the phone in the adb/fastboot folder
then
adb devices
(verify you phone are detect)
adb sideload name_of_the_rom_file.zip
(Wait the file is transfered to phone and recovery flash)
Click to expand...
Click to collapse
Fixed. I went into the att store and a nice gentleman told me what he did. He relocked the boatloader and ran the HTC ruu
xeas said:
Fixed. I went into the att store and a nice gentleman told me what he did. He relocked the boatloader and ran the HTC ruu
Click to expand...
Click to collapse
very good
i have the same problem but my phone is not being recognized everytime i pull up a linux terminal.
i flashed the android revolution 41 rom and after instalation i accidentally skipped the last step and got stuck in the loop
i am getting the same logo and the clockworkmod 6.0.3.4 screen for a few seconds the phone restarts and gets stuck at the htc logo.
i know some have had problems with their htc one on windows 8 so i went and made my pc ubuntu, same thing.
thanks in advance for the help
qibz said:
i have the same problem but my phone is not being recognized everytime i pull up a linux terminal.
i flashed the android revolution 41 rom and after instalation i accidentally skipped the last step and got stuck in the loop
i am getting the same logo and the clockworkmod 6.0.3.4 screen for a few seconds the phone restarts and gets stuck at the htc logo.
i know some have had problems with their htc one on windows 8 so i went and made my pc ubuntu, same thing.
thanks in advance for the help
Click to expand...
Click to collapse
Welcome to XDA
posting your problem with all the needed information in a new thread would help.
when making your post be sure and include
whats on the bootloader screen
and a copy/paste of the results from fastboot getvar all
most likely your not s-off or your not on the correct version of TWRP
also in your new post add @clsA so i get the notification that you posted

[Q] TF201 Bricked - Stuck at Asus splashscreen - Help?

I've had my Prime unlocked since I got it, I recently put on TWRP but kept the 4.1.1 OS stock rooted. Last night it was running slow, so I did a Data Wipe from the TWRP recovery screen. Now whenever I start it, it hangs on the ASUS splashscreen and does not boot. Holding the volume down and power button does not allow me to boot into recovery and my computer does not recognize it if I try to plug it in. This post sounds a lot like it, but I don't see a solution to it here. Thank you for any help!

Tried to Unlock Pixel 2 XL Now Stuck in boot mode!

Hi guys,
I think I made a huge mistake Any help appreciated...
I was following the Magisk and TWRP guides to try and root my phone. I thought it was all going well, but then when trying to flash TWRP, it didn't let me flash it to recovery, it said 'no partisan'. I found on a forum post to try the command 'fastboot getvar current-slot' (this returned a) then 'fastpool flash_a twrp.img'.
I tried this but then TWRP got stuck on the loading screen. I then realised that I couldn't boot into my Android version anymore as I'd flashed TWRP directly onto the boot partition! So I went about trying to flash my stock Android version back onto the phone... I then did this:
'fastboot boot_a boot.img' I stupidly then rebooted. I now am stuck with a perpetually spinning Google loading boot image. I can't launch into recovery mode as I have none, and when holding the power button and volume up it shows an info screen saying "PRESS POWER BUTTON TO PAUSE" and then it goes to the perpetual loading screen again.
I also can't do any more fast booting because adb cannot connect anymore...
Am I completely doomed?
silkt said:
Hi guys,
I think I made a huge mistake Any help appreciated...
I was following the Magisk and TWRP guides to try and root my phone. I thought it was all going well, but then when trying to flash TWRP, it didn't let me flash it to recovery, it said 'no partisan'. I found on a forum post to try the command 'fastboot getvar current-slot' (this returned a) then 'fastpool flash_a twrp.img'.
I tried this but then TWRP got stuck on the loading screen. I then realised that I couldn't boot into my Android version anymore as I'd flashed TWRP directly onto the boot partition! So I went about trying to flash my stock Android version back onto the phone... I then did this:
'fastboot boot_a boot.img' I stupidly then rebooted. I now am stuck with a perpetually spinning Google loading boot image. I can't launch into recovery mode as I have none, and when holding the power button and volume up it shows an info screen saying "PRESS POWER BUTTON TO PAUSE" and then it goes to the perpetual loading screen again.
I also can't do any more fast booting because adb cannot connect anymore...
Am I completely doomed?
Click to expand...
Click to collapse
I ended up eventually un-bricking my phone by booting into safe mode and re-connecting the ADB. I then successfully ran 'flash-all.'

HELP! Phone stuck at boot screen. I need help ASAP

I tried to root my phone for the first time.
I booted into TWRP and installed SuperSU and TWRP, then my phone rebooted.
When I try to reboot it or turn it off it does the following :
it starts booting up, then after a second it reboots again, then flashes the boot screen and repeats this a couple times until it gets stuck on the boot screen.
My phone is a LG G6 (h870) ThinQ.
Android version 8.0.0.
Everything I did prior to this :
unlocked my bootloader and that reset my phone,
after that I accidentaly wiped it again using the hard reset option (while booting holding the power button and volume down button),
then i booted into TWRP again and installed SuperSU.
This is what I followed after unlocking my bootloader : android blog.gs/how-to-root-lg-g6-and-install-twrp-recovery-on-it/
Thank you for any help.

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