broken recovery and no rom/os - Android Q&A, Help & Troubleshooting

I had a look at the suggested topics already mentioned surrounding my issue. "ilikebubbles" was the closet match, except they had an accessible OS where debugging and fastboot can be checked.
Im using and m8 international 2014 rooted device. build and software numbers are unkown at the moment as i didnt make a note of them when i rooted 9 months ago.
The problem began last night when i tried to flash "theunlockr.com/rom/ehndroix-v-14-10-22-rom/"via twrp. twrp in the past has always been super reliable and flashes roms at ease. last night i formated internal and wiped dalvick etc and then phone rebooted and tried to go back into recovery. the twrp splash screen flickered for a bout .6 of a second a few times and then hangs on the first htc splash screen. The only intervention that gets me into bootloader is holding power and the down vol.
i noticed i have s-on and cannot find a tutorial anywhere online i.e here, xda, google and utube on how to make this "off" Do i even need to for fixing twrp? All my adb's are current and i have the latest version of htc sync.
At the moment my bootloader offers from the top: ***unlocked*** in pink background
m8_ul pvt ship s-on
HBOOT-3.19.0.0000
RADIO-1/22/21331147A1.29G
openDSP-V46.2.2-00564-M8974_f0.0811
OS- 2048MB
eMMC-BOOT
OCT 30 2014,20:15:48
HBOOT (in blue background)
after the volume and power button instructions it reads:
FASTBOOT (in blue)
RECOVERY (in green)
FACTORY RESET ( in red)
SIMLOCK (in blue)
CHECK SMARTSD (in green)
IMAGE CRC (in pink)
SHOW BARCODE ( in blue)
i hope the above makes sense and someone can help fix this. it maybe a simple fix with loads of steps, but i have been on this all night and day now and it's not getting any clearer. Should have stuck with viper one rom
I can provide screen dumps of the bootloader screen via email if needed.
cheers in advanced guys for any ray of hope.

mattyssbates said:
I had a look at the suggested topics already mentioned surrounding my issue. "ilikebubbles" was the closet match, except they had an accessible OS where debugging and fastboot can be checked.
Im using and m8 international 2014 rooted device. build and software numbers are unkown at the moment as i didnt make a note of them when i rooted 9 months ago.
The problem began last night when i tried to flash "theunlockr.com/rom/ehndroix-v-14-10-22-rom/"via twrp. twrp in the past has always been super reliable and flashes roms at ease. last night i formated internal and wiped dalvick etc and then phone rebooted and tried to go back into recovery. the twrp splash screen flickered for a bout .6 of a second a few times and then hangs on the first htc splash screen. The only intervention that gets me into bootloader is holding power and the down vol.
i noticed i have s-on and cannot find a tutorial anywhere online i.e here, xda, google and utube on how to make this "off" Do i even need to for fixing twrp? All my adb's are current and i have the latest version of htc sync.
At the moment my bootloader offers from the top: ***unlocked*** in pink background
m8_ul pvt ship s-on
HBOOT-3.19.0.0000
RADIO-1/22/21331147A1.29G
openDSP-V46.2.2-00564-M8974_f0.0811
OS- 2048MB
eMMC-BOOT
OCT 30 2014,20:15:48
HBOOT (in blue background)
after the volume and power button instructions it reads:
FASTBOOT (in blue)
RECOVERY (in green)
FACTORY RESET ( in red)
SIMLOCK (in blue)
CHECK SMARTSD (in green)
IMAGE CRC (in pink)
SHOW BARCODE ( in blue)
i hope the above makes sense and someone can help fix this. it maybe a simple fix with loads of steps, but i have been on this all night and day now and it's not getting any clearer. Should have stuck with viper one rom
I can provide screen dumps of the bootloader screen via email if needed.
cheers in advanced guys for any ray of hope.
Click to expand...
Click to collapse
You are on HTC M8 International version. Yes?

Dom3616 said:
You are on HTC M8 International version. Yes?
Click to expand...
Click to collapse
yes, locked into 02 uk, marvellous phone!

mattyssbates said:
yes, locked into 02 uk, marvellous phone!
Click to expand...
Click to collapse
Have you tried doing a Factory Reset? WARNING: It will erase all your data.

Dom3616 said:
Have you tried doing a Factory Reset? WARNING: It will erase all your data.
Click to expand...
Click to collapse
yeah, hard reset (with vol down and power held down for 10 secs) seems to load bootloader but when selecting the factory reset option it just goes into the boot cycle as an infinite loop not progressing beyong the attempt at launching twrp. the only way to shut the phone off is to excecute the fast boot option (not pc plugged in) and hold vol down and power. Thats about the full functionality i have at the moment. All data is secured by titainuim on sd card and cloud.

mattyssbates said:
yeah, hard reset (with vol down and power held down for 10 secs) seems to load bootloader but when selecting the factory reset option it just goes into the boot cycle as an infinite loop not progressing beyong the attempt at launching twrp. the only way to shut the phone off is to excecute the fast boot option (not pc plugged in) and hold vol down and power. Thats about the full functionality i have at the moment. All data is secured by titainuim on sd card and cloud.
Click to expand...
Click to collapse
First follow this guide to unlock bootloader and achieve S-OFF. This will wipe your data.
Then follow this guide. Its very detailed. Make sure you follow the steps to restore your phone to official firmware.

Related

My Hero is stuck on HBOOT

After my battery was empty i had to restart my Hero and now it's stuck in HBOOT
I tried already almost everything. I can't go to recovery, only to clearstorage.
I've connected my phone and tried many ways to boot in recovery but my computer doesn't recognize my phone(error: device not found).
When I'm in HBOOT i have two options, simlock and fastboot.
If i press back for fastboot nothing happens, and if i press send for simlock it says open file fail, Reboot device?
Some extra informaton
HERO CVT SHIP S-ON
HBOOT-1.76.0004 (HERO10000)
MICROP-010f
TOUCH PANEL-SYN0104
RADIO-6.35.08.22
Jul 3 2009, 15:22:21
HBOOT
Anyone who has any idea?
Have you tried rebooting in recovery to see if that works?
Can't seem to get into recovery... It just always comes back to hboot( or clearstorage), no matter what combination of buttons i try
i have the exact same problem, i am in need of a solution as well
Someon who can help us?
simonflore said:
After my battery was empty i had to restart my Hero and now it's stuck in HBOOT
I tried already almost everything. I can't go to recovery, only to clearstorage.
I've connected my phone and tried many ways to boot in recovery but my computer doesn't recognize my phone(error: device not found).
When I'm in HBOOT i have two options, simlock and fastboot.
If i press back for fastboot nothing happens, and if i press send for simlock it says open file fail, Reboot device?
Some extra informaton
HERO CVT SHIP S-ON
HBOOT-1.76.0004 (HERO10000)
MICROP-010f
TOUCH PANEL-SYN0104
RADIO-6.35.08.22
Jul 3 2009, 15:22:21
HBOOT
Anyone who has any idea?
Click to expand...
Click to collapse
Did you install any other ROM aside from the official ROM code?
I installed the Modaco Rom 2 weeks ago, and it worked fine all the time
Damn, I'll guess it's bricked if nobody knows the answer...
Strange, without doing anything...
have you tried booting/flashin the recovery image from fastboot mode?
simonflore said:
Damn, I'll guess it's bricked if nobody knows the answer...
Strange, without doing anything...
Click to expand...
Click to collapse
I guess I also had a similar issue this morning when I was trying to root my phone and it was stuck at 41% while updating ROM. I just did it again after plugging out the USB Cable and running the Ruu.exe and it updated the ROM within 5 mins. I guess in my case it was a case of my Windows getting hung (I was running it within Mac using Parallels), and it just worked after inserting the USB cable again.
Try running the update from another computer (after installing HTC Sync on that ..)
Good luck!
Hi guys, I have exactly the same problem.
One night the volume button would not work. So i rebooted to fix the problem. It rebooted into HBOOT. The screen with the 3 skateboards?
I only get two options
<Back> Fastboot Mode
The back button does not trigger fastboot!!
<Send> Simlock
Doing this only says
FAT32 Init Ok
Open File Fail
Reboot Device?
<Menu> Reset Device
I do so but it reboots directly into hboot again.
It also does a SD card check when it boots up onto this screen, says something like
herodiag.zip
etc etc
and it says not found i think, it goes very fast.
Anyway I am very frustrated. I was using Modacos 3.0. Without many problems.
I have a bad feeling that my phone is bricked.
Any help would be much appreciated.
And yes I have already tried countless combinations of button presses, all still go back to the skateboard screen.
dwarfhero said:
One night the volume button would not work. So i rebooted to fix the problem. It rebooted into HBOOT.
Click to expand...
Click to collapse
this may sound like a silly comment, but to me it sounds like your VOlume Down button is stuck.
anyone else with a perfectly working hero can try this.
no matter what combination of buttons you press, if you have volume down pressed, it goes into hboot (or it seems to on mine, anyway)
O ok, any idea how I can sort of unstick it?
Seems like a good explanation.
on my cdma hero, following the directions i found online everywhere(hold home and boot) i was getting a HBOOT screen with only an option to erase all settings until i:
1. pop battery
2. reboot while holding vol-down, back arrow and power button
3. this time at the HBOOT screen there is an option to enter recovery mode(i think with a home press) fastboot or simlock
moisture in your HTC hero
It's possible that your 'volume down'-button is stuck because of moisture in you hero. I had the same problem. You have to warm your hero with warm air. CAUTION, make your hero NOT TOO HOT.

Trying to restore a stock-unrooted phone.

I must admit, I don't know much about HTC devices. I've been on Moto devices for years. Unfortunately for me, when a co-worker screws their phone they come to me shouting "you hacked your phone, fix mine!"
This particular case is a doozy and I've never seen any problems like this before. I've searched the forums quite a bit but only found semi-similar problems with devices being rooted and such.
The scenario is apparently she was playing a game on her stock, unrooted, HTC Evo 4G LTE when the phone rebooted for no reason. When it restarted, it would only go to a white splash screen with the following information:
*** LOCKED ***
JEWEL PVT SHIP S-ON RL
HBOOT-1.19.0000
RADIO-1.12.11.0809
OpenDSP-v29.1.0.45.0622
eMMC-boot
Aug 9 2012, 15:14:25
HBOOT
<VOL UP> to previous item
<VOL DOWN> to next item
<POWER> to select item
FASTBOOT
RECOVERY
FACTORY RESET
CLEAR STORAGE
SIMLOCK
IMAGE CRC
SHOW BARCODE
This whole screen is a new experience for me and the catch is, I cannot make a selection. I can press the power button all I want at any of the options, and the darn thing will not do anything.
The only thing I can do at the moment is turn it back off and let it charge.
A few days ago when she first brought it to my attention, I ran threw some trouble shooting scenarios that Motorola users should go through, the first of which being make sure the darn thing is charged. We did so at work, and when she tried to boot it again, it gave some errors about trying to load a .img file as well as a .zip file under the information screen posted above.
I assumed that this was the phone trying to boot from a system image that was corrupt or not there. Unfortunately I don't have the exact information as I cannot replicate the error right now.
I was hoping that I could bring it home and either put an "update.zip" file in it and have it "repair" the system files, or push a stock system onto the device through a Windows app, but I'm not coming up with anything in my searches.
Can anyone shed some light on this situation for me?
I'm positive it was unrooted and stock. She removed the SD car before letting me take it, however, I do have a spare I can use to put any files on it should I get the options to work.
Go get the RUU zip file from http://unlimited.io (choose S-off exploits > Dirty Racun > Evo 4G LTE > then on the right side is the RUU.zip download and then put it on the sdcard as "PJ75IMG.zip" minus "" and the caps matters in this case.
Thanks for the info. So far I've been able to replicate the previous error message which was stating it was missing the exact image file you pointed me to.
I put the .ZIP file into the root of my spare SD card and slapped it in. The phone started loading it automatically, and stops once reaches "Parsing... [SD ZIP]" with a number of options (1-19)
The only button that does anything, maybe helped by the fact that the Volume down button is apparently not working, is the volume up button. If I hold it, it will ask if I want to load the .ZIP file. If I let go of the button at all, it immediately tells me: "Cancel update! Press power to reboot"
The same thing happens if I just press the volume up button at that same screen.
After this, I figured out how to boot into safe mode, but don't know where to go from there as a normal boot is still impossible, and I need to get the pattern to unlock it from her later today...
I thought the ruu was ran from fast boot USB from your pc
Sent from my EVO 4G LTE using xda premium
RUU is run through fast boot and on board the device. You need to delete the game app if you can get in through safe mode.
If your in safe mode when you get the unlock pattern. Go into settings/sd-card/factory reset. Remember to export her contacts to the SD card because if you don't they will be deleted unless she already synced her contacts via google.
#Root-Hack_Mod*Always=LTE
Okay. So far I've been able to export everything from the phone onto my SD card and my computer. Managed a factory reset, but in the end, it's the same results. Safe mode seems to work, but when I boot normally, without the SD card in, I only get the white screen, (Hboot? Bootloader? I dunno) and when I have the SD card in, it tries to load the image files, but won't let me because of this bug with the volume up button.
Did you select factory reset from within the phone itself or threw the boot loader also when you say white screen, is there any kind of errors or information on the screen ??
#Root-Hack_Mod*Always=LTE
I did it through the phone it's self in safe mode. I took my SD card out and rebooted before I did so.
The white screen is same one from my first post. An all white screen, the skate boarding android's at the bottom, and this info in different colors:
*** LOCKED ***
JEWEL PVT SHIP S-ON RL
HBOOT-1.19.0000
RADIO-1.12.11.0809
OpenDSP-v29.1.0.45.0622
eMMC-boot
Aug 9 2012, 15:14:25
HBOOT
<VOL UP> to previous item
<VOL DOWN> to next item
<POWER> to select item
FASTBOOT
RECOVERY
FACTORY RESET
CLEAR STORAGE
SIMLOCK
IMAGE CRC
SHOW BARCODE
I can move to select them through the volume up button, but the volume down doesn't work, and the power button does nothing unless held for several seconds.
Get into fast boot USB mode (select fast boot) and then fastboot erase userdata
Sent from my hidden jewel
psychot3ch said:
I did it through the phone it's self in safe mode. I took my SD card out and rebooted before I did so.
The white screen is same one from my first post. An all white screen, the skate boarding android's at the bottom, and this info in different colors:
*** LOCKED ***
JEWEL PVT SHIP S-ON RL
HBOOT-1.19.0000
RADIO-1.12.11.0809
OpenDSP-v29.1.0.45.0622
eMMC-boot
Aug 9 2012, 15:14:25
HBOOT
<VOL UP> to previous item
<VOL DOWN> to next item
<POWER> to select item
FASTBOOT
RECOVERY
FACTORY RESET
CLEAR STORAGE
SIMLOCK
IMAGE CRC
SHOW BARCODE
I can move to select them through the volume up button, but the volume down doesn't work, and the power button does nothing unless held for several seconds.
Click to expand...
Click to collapse
Pm sent
#Root-Hack_Mod*Always=LTE
Indirect said:
Get into fast boot USB mode (select fast boot) and then fastboot erase userdata
Sent from my hidden jewel
Click to expand...
Click to collapse
That's just the thing. I can't actually make a selection. If there was a way to initiate it at the computers end like I can with my Spyder, I don't think I'd have a problem. I don't have any software or drivers though for the Jewel.
Sorry for a late response. Got a bunch of double shifts lately.
Just another angle to attack this issue....the volume down button isn't stuck in the pressed position is it? From how I read your OP, it sounded like it was behaving as if volume down is being held down during bootup which would keep getting stuck at bootloader....if its been verified not to be stuck then I apologize for the tangent...hope you get it figured out...
Sent from my EVO using xda app-developers app
I understand the confusion about the button.
It isn't actually stuck in the pressed position to my knowledge. It seems like it just doesn't register anything when you press the button. I have removed the rocker for an idea for a test, but still got the same result.
I can't be completely sure it isn't stuck past the button though. The actual mechanism clicks like it's supposed to at least.

[Q] HTC one stuck in bootloader loop, not rooted!

Last night, my HTC One Mini died on me. Upon plugging it in and rebooting, it sent me to the bootloader screen. It said as follows.
***LOCKED***
M4_UL PUT SHIP S-ON RL
HBOOT-2.19.0000
OS-1.32.502.3
eMMC-boot 1024MB
Sep 3, 2013, 11:06:59.0
HBOOT
<VOL UP> to previous item
<VOL DOWN> to next item
<POWER> to select item
FASTBOOT
RECOVERY
FACTORY RESET
CLEAR STORAGE
SIMLOCK
IMAGE CRC
SHOW BARCODE
I clicked on fastboot, attempting to hit "Reboot" "Reboot Bootloader" and "Power Down" but all led me back to the same screen. So I scoured the internet, finding various fixes. The ones that didn't involve the computer, all didn't work (such as holding down the power button in bright light), and all the others involved "rooting" the phone. I am not nearly tech-savvy enough to do anything involving code of the sort. I also have no backup (noob move, yes I know). Is there any way to fix my phone without losing any of my data or having to use code or rooting (knowing me, I would end up destroying the thing).
Hate to say it but try the factory reset option. You will loose everything, but you SHOULD(don't hold me to it) regain your phone.
Sent from my HTC One using XDA Premium 4 mobile app
smokinmoses said:
Hate to say it but try the factory reset option. You will loose everything, but you SHOULD(don't hold me to it) regain your phone.
Sent from my HTC One using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Well I tried that, but it just rebooted me to the same screen. I guess i just have to go to the store and have them take a stab at it because I am NOT gonna root that thing :/
Help. Unrooted HTC one won't boot
I was updating my phone through my PC and left it overnight. I woke up to meet it in the bootloader screen and since then nothing has worked. I can't select any of the options. When I move to an options and press the power button nothing happens.
kaysongz said:
I was updating my phone through my PC and left it overnight. I woke up to meet it in the bootloader screen and since then nothing has worked. I can't select any of the options. When I move to an options and press the power button nothing happens.
Click to expand...
Click to collapse
what software were you using on your pc to update your phone ?
Did you get this fixed Im in the same boat as you are. I cant get into recovery, everyfastboot command I try gives me a failed not allowed. Im on S-off superCID 11111111. Any way i try reboot, reset reboot bootloader takes me to same screen with same failed.
Any ideas?

Relationship: USB plugged in and Fast Boot (not fastboot)

IF
( Fast Boot is unchecked [in Settings/Power/Fast boot] AND usb cable is attached )
THEN
using the power button to “power down” phone immediately boots to unresponsive TWRP screen.
ENDIF
What is the relationship between Fast boot/Slow boot and the usb cable? Is this usual behavior?
I am assuming this is a problem and show the important information for my phone below
HTC One Max Phone state:
*** TAMPERED ***
*** UNLOCKED ***
T6UL PVT SHIP S-OFF RH
CID-VODAP001
HBOOT-2.49.0000
RADI0--4T.24.3218.09
OpenDSP-,v33.120.274_T6.0829
QSC*
OS-
eMMC-hoot 2048MB
Feb 7 2014J15:26:45.0
Here is what I did leading up to this problem:
1. Unlocked bootloader (htcdev)
2. SuperSU (v2.01)
3. Nandroid backup with TWRP (which backed up boot and system and data partitions)
4. Try to install xposed (since I want control over my sd card!) Noticed that it would be easier if I had s-off (and wanted to s-off sometime anyway).
5. S-off using firewater (which worked)
6. Nandroid restore - restored system and data partitions (not boot)
Noticed problem at this point.
Here is what I have done so far in an attempt to fix this problem:
1. booted to TWRP recovery (via adb) and did wipe (factory reset - which wipes data, cache and dalvik). Problem still there.
2. Nandroid restore - restored boot and system and data partitions. Problem still there.
3. TWRP – fix permissions. Problem still there.
It actually doesn't have anything to do with fast boot option under battery in settings.
If you power off the phone with this phone connected you will end up with it in that "stupid mode". The fix is to disconnect from your pic until you are sure the phone is 100% off. I forget about this little bug from time to time and end up having to do the power + volume up to force a restart.
This isn't really room related and I believe it's a conflict between the power off charging animation and twrp. It's not you....so just try and avoid the above scenario

Nexus 9 OTA 5.1.1 endless boot

Nexus 9 WIFI 16Gb stock android now stuck in endless boot after OTA 5.1.1.
Unfortunately I have a few valuable files on the device that haven't been backed up. Do I have any options to get the files back?
This is what I've tried so far:
1. Wipe cache from recovery menu. Had a warning about low diskspace before OTA that I had fixed by clearing cache for individual apps.
2. adb sideload 5.1.1
None of them worked. The latter fails because it will only upgrade from an older version and claims I already have 5.1.1.
Do I have any options left to pursue other than set this crappy device on fire and forget about it? :crying:
Mine was updated today and it's randomly rebooting. I've cleared the cache and factory reset from stock recovery like 3 times so far. And I'm still dealing with that. Mind you I just bought this thing this morning. It maybe going back soon if no daylight is found.
Have this issue too (assuming it's from the latest update). I've already done a cache wipe and factory reset. It's still on endless boot. It boggles the mind as to how such a thing can happen on a stock device.
Is there anyone outthere that was able to solve this by not sending the device in?
conceptics said:
Have this issue too (assuming it's from the latest update). I've already done a cache wipe and factory reset. It's still on endless boot. It boggles the mind as to how such a thing can happen on a stock device.
Is there anyone outthere that was able to solve this by not sending the device in?
Click to expand...
Click to collapse
Did you ever unlock the bootloader?
madbat99 said:
Did you ever unlock the bootloader?
Click to expand...
Click to collapse
No... never. It's completely stock. Any advice?
conceptics said:
Have this issue too (assuming it's from the latest update). I've already done a cache wipe and factory reset. It's still on endless boot. It boggles the mind as to how such a thing can happen on a stock device.
Is there anyone outthere that was able to solve this by not sending the device in?
Click to expand...
Click to collapse
conceptics said:
No... never. It's completely stock. Any advice?
Click to expand...
Click to collapse
Hi, conceptics...
If you haven't unlocked the bootloader, or enabled the 'OEM unlock' setting in Developer Options...
SETTINGS>> DEVELOPER OPTIONS>>OEM unlocking (allow the bootloader to be unlocked)
...then your options are limited.
-----
With an unlocked bootloader, or at the very least, with the option to unlock the bootloader, (and which requires the above setting to be enabled, and which requires Android to be fully booted in order to enable it), your Nexus 9 would almost certainly be recoverable by simply reflashing it with a Nexus 9 Google factory stock image, or fastboot flashing TWRP Custom Recovery, and then using an ADB 'pull' command to copy your stuff off of the device to your laptop/PC.
But with a locked bootloader, and likely an unlockable bootloader, these options aren't available.
I suspect you're going to have to return your device under warranty .
-----
But before you do...
Have you tried booting the Nexus 9 into Safe Mode?
-----
Safe Mode is ostensibly an Android troubleshooting mode, designed to temporarily suspend all third party (possibly rogue, badly written) user installed apps (those installed via PlayStore or user 'sideloaded' APKs) and just boots the bare essentials of the Android OS.
Now normally, booting into Safe Mode is accomplished by pressing the Power button as normal for shutdown, and then LONG PRESSING on the 'Power Off' dialogue box/option that appears and which you then just normally tap on.
(See second and third attached screenshots.)
Obviously this isn't an option if Android won't boot in the first place, due to it bootlooping.
But like the older Nexus 7, the Nexus 9 can be Safe Mode booted from a complete shutdown state.
Here are the instructions...
bftb0 said:
...
....
[size=+1]Safe Mode Boot[/size]
From a cold start boot (press & release Power button), wait 2 seconds after the B&W Google (bootloader) splash screen appears, then press and hold Vol-Down button until the normal OS boot is fully completed (lock screen or home screen appears)
....
...
Click to expand...
Click to collapse
Full post here: http://forum.xda-developers.com/showthread.php?t=2133986
-----
Precision is required for this button combination...
Power on the device, and RELEASE the power button after the black and white Google logo has displayed for about 2 seconds, then PRESS AND HOLD the Volume Down button ONLY... and KEEP IT HELD DOWN until the device completes booting.
Whilst this Safe Mode boot instruction is written with the Nexus 7(2012) in mind, it also works with the Nexus 9.
I've just tested this procedure on my own Nexus 9. See last attached screenshot
As you can see from the screenshot, all of my user installed apps are 'greyed out' and are temporarily unavailable for use. Notice also the Safe Mode message in the lower left hand corner.
(See attached screenshot four.)
----
If you do successfully boot into Safe Mode, you can then uninstall any or all third party apps that might be problematic, and more importantly go to...
SETTINGS>>ABOUT TABLET>>Build Number ...and then tap 7 times on the Build Number until you become a 'Developer' (...if only it was that easy... )
...and then go to...
SETTINGS>> DEVELOPER OPTIONS>>OEM unlocking (allow the bootloader to be unlocked)
...and enable (checkbox tick it) that infernal setting that has caused so much trouble for Nexus 9 owners!!!
(See first attached screenshot.)
If all of this works, you can then unlock the bootloader, and reflash the device... .
-----
My suggestions here are what in America I think are called a 'Hail Mary Pass', and I am not particularly optimistic it will fix your Nexus 9 .
But it's gotta be worth a shot.
You have nothing to lose by trying it.
Best of luck, and I hope this helps.
Rgrds,
Ged.

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