Nexus 9 bootloop & locked bootloader - replace motherboard ? - Nexus 9 Q&A, Help & Troubleshooting

Hey there,
as i tryed to flash a rom to my Nexus 9 the bootloader got locked somehow and now the device is stocked in bootloop.
I tryed everything from flashing to sideloading and nothing seems to work. I also cannot unlock the bootloader again since the option for "Enable OEM unlock" was opted out.
Would it be an option to just replace the whole motherboard to fix the bootloop?
Thank for you help

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Edl dead recovery Rn4 unofficial bootloader unlocking

Hello guys,it's been 3 days since I applied for unlocking my RN4 and even after getting permission I wasn't able to unlock it
Last night I got frustrated and started looking for any unofficial trick like RN3 has.... What they do is put their device in edl mode and flash a moded apps boot.mbn file and then on fastboot they execute the unlock boatloader command like fastboot OEM unlock and get a working unlocked bootloader for their device.....
I used to work as a professional DRS -digital repair specialist in reliance Jio so there we. Had a water 2 named mobile which can't be fixed after soft brick as it had the edl mode via any cable or any other process so when I opened the handset I saw those dot pinouts and tried to short them one by one and finally I got it to boot in edl mode and then flash it with qfil.....
Same as that phone... This RN4 also had those pin outs, so I opened the back and started shorting pin outs while battery was unplugged and hey yehh that let my phone in edl mode huhu ... I was happy and to test if it works or not... I got a global fastboot ROM and I wasn't able to flash it before edl via fastboot but now.... When I fired up mi flash... Set directory I was able to get it in working state (yes soft brick RN4 got life)
Than I got a twrp recovery and renamed it to recovery. IMG and put it inside of mido(RN4) flashing folder and flashed it .... But sadly even after it got flashed via mi flash I saw stock recovery...
So here I am asking for a file to get our bootloader unlocked which is emmc_appsboot.mbn
I'll upload the original file and it will be glad if some one will help me to modify that mbm file to make it unlock via fastboot.........
Let's see if people dev. Will help me or not..
Or even if some one will give me a already unlocked bootloader IMG or mbn file I'll proceed further... So plz do help me... We're soon close to get an unofficial bootloader for our beloved RN4..
You will be able to unlock 100% within 7 days... If you have a Current account is not bound to this device error
Kevin Saiza said:
You will be able to unlock 100% within 7 days... If you have a Current account is not bound to this device error
Click to expand...
Click to collapse
Hi Kevin!
7 days from when? Receiving the bootloader unlock permission, since our last try or what?
droidiser said:
Hi Kevin!
7 days from when? Receiving the bootloader unlock permission, since our last try or what?
Click to expand...
Click to collapse
Knock knock.. 50-50.. It's sometimes from the day you had permissions from Xiaomi, sometimes it's from last try. BlameXiaomi
Unlocking bootloader is nightmare on Mi phones. I was trying to upgrade to MIUI 9 Developer ROM from my current stable and I have to unlock the bootloader to do so. It's crazy ! I didn't have to do that on Redmi Note 3. It was easy to switch between stable and developer roms from updater app.
Anyone has any idea how can I flash the latest developer build on my Redmi Note 4 with out unlocking bootloader?
devil2016 said:
Unlocking bootloader is nightmare on Mi phones. I was trying to upgrade to MIUI 9 Developer ROM from my current stable and I have to unlock the bootloader to do so. It's crazy ! I didn't have to do that on Redmi Note 3. It was easy to switch between stable and developer roms from updater app.
Anyone has any idea how can I flash the latest developer build on my Redmi Note 4 with out unlocking bootloader?
Click to expand...
Click to collapse
Developer Build can be installed without unlocking bootloader from updater on Redmi Note 4 also.

Your device cannot be checked for corruption after stock rom

Today I've installed a stock rom on my LG G5 H850.. But I still get the message that my phone can't be checked on corruption, is there a way I can remove this message on bootup?
You need to relock the bootloader using fastboot and adb
https://forum.xda-developers.com/lg...bootloader-t3363040/post66780026#post66780026
Can this problem also cause that I still cant update android after flashing the stock rom?
OEM lock is not enabled in developer options btw.. I cant check the option to unlock oem

Moto Z bricked OEM Locked

Hello friends of XDA, I have a big problem between hands, I have a MOTO Z and I had it in android 7.0 since last year the update to andorid 7.1.1 did not arrive and I felt that with android 7 the battery was consumed very quickly, so I tried to find the update to flash it and just about 3 days ago I found it, I proceeded to download it and flash it in fastboot and adb.
The thing is that a few months ago, browsing through my phone (I had already rotated it, and unlocked the bottloader, I decided to re-block the bootloader, and remove the root, which never worked at 100) I got into the developer options, and I saw an option that until then I didn't know about its "OEM Unlock"function, as it was turned on and deactivated because I thought it didn't work.
Returning to the update flashing I proceeded as usual, with the commands, I proceed to restart the device and show the image of the boot of motrola but then it shows me a message in red letters.
"Startup Failed"
"failed to pass validation, backup to fastboot.
I thought it was a compatibility problem with the downloaded version of 7.1.1 so again I decided to flash the stock rom 7.0 but when I finished and restart the same message appeared.
I started to investigate and it seems that the OEM blockade is responsible for not being able to install any Stock Rom, or anything, and now I have a nice brick with Moto mods and I can't use it.
I wanted to unlock OEM in fastboot but nothing. sends message from "ALLOW OEM UNLOCK IN SETTINGS"
There is way to unlock the OEM from pc or fastboot without needing to be unlocked from the android settings, as in my case it is impossible for me,
I'd be very grateful for your help friends, I know it's a bit tedious to read but it's the only phone I have and I feel weird without it on the street.:bueno::bueno::llorando:
I'm with same problem here!
Suckmymfdick17 said:
Hello friends of XDA, I have a big problem between hands, I have a MOTO Z and I had it in android 7.0 since last year the update to andorid 7.1.1 did not arrive and I felt that with android 7 the battery was consumed very quickly, so I tried to find the update to flash it and just about 3 days ago I found it, I proceeded to download it and flash it in fastboot and adb.
The thing is that a few months ago, browsing through my phone (I had already rotated it, and unlocked the bottloader, I decided to re-block the bootloader, and remove the root, which never worked at 100) I got into the developer options, and I saw an option that until then I didn't know about its "OEM Unlock"function, as it was turned on and deactivated because I thought it didn't work.
Returning to the update flashing I proceeded as usual, with the commands, I proceed to restart the device and show the image of the boot of motrola but then it shows me a message in red letters.
"Startup Failed"
"failed to pass validation, backup to fastboot.
I thought it was a compatibility problem with the downloaded version of 7.1.1 so again I decided to flash the stock rom 7.0 but when I finished and restart the same message appeared.
I started to investigate and it seems that the OEM blockade is responsible for not being able to install any Stock Rom, or anything, and now I have a nice brick with Moto mods and I can't use it.
I wanted to unlock OEM in fastboot but nothing. sends message from "ALLOW OEM UNLOCK IN SETTINGS"
There is way to unlock the OEM from pc or fastboot without needing to be unlocked from the android settings, as in my case it is impossible for me,
I'd be very grateful for your help friends, I know it's a bit tedious to read but it's the only phone I have and I feel weird without it on the street.:bueno::bueno::llorando:
Click to expand...
Click to collapse
Try to boot in Fastboot flash twrp and flash ressurection remix rom. It's great rom. Forget about locking. I had the same problem like you as I was trying to flash stock ROM and lock bootloader.
I gave up on this.
knjigo said:
Try to boot in Fastboot flash twrp and flash ressurection remix rom. It's great rom. Forget about locking. I had the same problem like you as I was trying to flash stock ROM and lock bootloader.
I gave up on this.
Click to expand...
Click to collapse
Well, when the root didn't work properly, I flashed the phone again and blocked the bootloader. Will I still be able to install TWPR or should I lose my phone?
Suckmymfdick17 said:
Well, when the root didn't work properly, I flashed the phone again and blocked the bootloader. Will I still be able to install TWPR or should I lose my phone?
Click to expand...
Click to collapse
What do you mean with "I blocked my bootloader"?
Twrp is easy to flash. Root is integrated in ressurection remix rom. And this rom is great. Just try to flash twrp in Fastboot and than ressurection remix with twrp.
Can you boot in Fastboot?
Do you remember what build of 7.1.1 you had on your device before downgrading to 7.0?
If so, I would suggest finding that firmware (the full stock firmware, not OTA updates) or newer if you can, and try to flash that. Since your bootloader is still likely from the 7.1.1 build, a locked bootloader will only permit files matching the same patch level (i.e. from the exact same stock ROM as that bootloader patch) to boot.
If not, then unfortunately there's not a lot we can do. You could wait for a newer firmware to get leaked, but as your device is unable to boot (due to failing the bootloader checks) and you cannot toggle OEM unlocking because you cannot boot, it's a nasty vicious circle that is difficult to get out of. You may have to consider sending your device for service and pay for an expensive motherboard replacement otherwise, since Motorola have a record of your device being unlocked. Your service centre experience may vary.
Only lock a bootloader after ensuring you've flashed all the stock firmware and it is all the same patch level as your bootloader. Hopefully you'll find newer firmware that you can repair with.
tjgibri said:
I'm with same problem here!
Click to expand...
Click to collapse
I solved it, I finally flashed the stock rom to my phone and it works.
Apparently my pc was not flashing the stock rom in adb, and the phone turned off when loading the software. I did it 3 times until I load correctly and start well.
if you have the same problem apparently then OEM Blocking is not responsible. You have to flash the most current rom or the one that you had by default when the brick happened to you, you flash it in a normal way with commands of adb and ready, I would have to come back to life.
download from firmware center MotoZ Griffin the most current rom stock at 7.1.1
echo92 said:
Do you remember what build of 7.1.1 you had on your device before downgrading to 7.0?
If so, I would suggest finding that firmware (the full stock firmware, not OTA updates) or newer if you can, and try to flash that. Since your bootloader is still likely from the 7.1.1 build, a locked bootloader will only permit files matching the same patch level (i.e. from the exact same stock ROM as that bootloader patch) to boot.
If not, then unfortunately there's not a lot we can do. You could wait for a newer firmware to get leaked, but as your device is unable to boot (due to failing the bootloader checks) and you cannot toggle OEM unlocking because you cannot boot, it's a nasty vicious circle that is difficult to get out of. You may have to consider sending your device for service and pay for an expensive motherboard replacement otherwise, since Motorola have a record of your device being unlocked. Your service centre experience may vary.
Only lock a bootloader after ensuring you've flashed all the stock firmware and it is all the same patch level as your bootloader. Hopefully you'll find newer firmware that you can repair with.
Click to expand...
Click to collapse
Thanks for your help friend, I finally flashed it with a recent android 7.1.1 update. Apparently the OEM lockout was not the culprit, but it was an interrupted flash of android 7.1.1 at some point when loading the software to the phone, it would shut down on its own and not complete the installation, which showed me the mentioned message. I didn't realize that and thought it was the OEM blockade.
I finally did it on another pc and it worked. the phone came back to life.
I have one Moto Z2 Force (XT1789-05), bought from coolicool.com, I didn't know device came Unlocked Bootloader, Device rom had problem with many apps, I googled and found one topic in XDA developer to Install Stock Rom, I downloaded and Installed India Rom, it's worked somehow fine, but still had problem, I downloaded Verizon Rom, Android 8, after Installed Android 8 Verizon Rom, Locked device bootloader immediately, now device stuck at Welcome Wizard in Android 8, after select language I got this message: (Please wait, this may take a few minutes) this is proof video (http://ahmn.co/Upload/IMG_0161.MOV), after this issue, device already locked, I can't unlock, because need to go to the Developer Option in Setting, I stucked in Welcome Wizard, there isn't any bypass, So, I start to search in Google, XDA-Forum, Android Central and more, I created many threads, many requests, no one can't help me, I tried to reach google developer support to the tell to me how can I bypass Android 8 Welcome Wizard, there is must be a way, but I can't find it, now I can access to Android Recovery and Bootloader
1. if you help me to FORCE UNLOCK device without need Developer Option in setting my problem will solve
2. If you help me to Bypass Android Welcome Wizard, access setting and enable OEM Unlock
3. If you help me to update the device from Android 8 to Android 9 Verizon ROM via ADB Sideload or Update from SD card in Recovery mode
4. If you have any idea to how can I fix it
Extra Information: I bought Belkin and Uni USB-C to Ethernet Adaptor to help me bypass Android 8 Welcome Wizard, I bought WSKY WIFI Adaptor because device Wifi can't find any network (I found QR setup by tap several times in Language Selection), after this section need to download google device policy apk, my device can't find any Wifi Network and my Ethernet Adaptor can't help me either, So, I just remained with my phone, and I can't do anything,
Please, someone, help me
My Device SKU: XT1789-05

OEM toggle not working?

Hello!
I have a problem. Well, on short I bought Galaxy S9+ about a month ago. Exynos version. I managed to root it and install twrp without a problem. Now, I went to factory reset my phone and install ElementalX. The problem is now, I can see the OEM unlock option in the developer menu, but every time i toggle it on, the device factory resets and the OEM Unlock is still off. Tried different TWRP versions, tried OEM fix and multiple guides. Anybody have the same problem? Lost my root now
Found the problem. I updated my phone with Smart Switch to the latest version. Reflashed ARC5, managed to get root and OEM Unlock was on, as soon as I flashed the old firmware.

Huawei Y6 SCL-U31 stuck in Bootloop, tried all method but didn't work. Help needed.

My Huawei Y6 SCL U31 got stuck in bootloop. I tried to put it in recovery mode, didn't work. Tried to flash new ROM in it but the phone is OEM locked. After messing on internet for 2 days I got to know that my bootloader should be unlocked in order flash new ROM on it. I tried multiple unlocking tools but they ask for Huawei Unlock 16 Digit code and apparently Huawei has taken down the page a while ago. All I can do is to put it on fastboot mode which says FRP lock Device Lock. Please anyone tell me how to unlock the bootloader or a fix which can make my phone work again. thanks.
HELP
ahsanraza said:
My Huawei Y6 SCL U31 got stuck in bootloop. I tried to put it in recovery mode, didn't work. Tried to flash new ROM in it but the phone is OEM locked. After messing on internet for 2 days I got to know that my bootloader should be unlocked in order flash new ROM on it. I tried multiple unlocking tools but they ask for Huawei Unlock 16 Digit code and apparently Huawei has taken down the page a while ago. All I can do is to put it on fastboot mode which says FRP lock Device Lock. Please anyone tell me how to unlock the bootloader or a fix which can make my phone work again. thanks.
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I have tried almost all the available stock roms available on my Y6 but apparently non of them work. need help!
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