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[Q] [HELP] Stuck on NVidia Boot screen

Rooted when I first got the tablet, was not using it much. Used Kingoo to remove root. On reboot it is now stuck at the NVidia logo.
When I reboot into recovery mode and select factory reset I get a CWM manager screen, select factory reset and reboot. Still stuck on the NVidia logo (currently in excess of 30 minutes.)
Any ideas?

Solved it:
Solution:
1. Register for the NVidia Developer program (I chose the gaming selection, not hardware). Takes about 30 seconds: https://developer.nvidia.com/gameworks-registered-developer-program
2. Download & unzip the Shield Software: https://developer.nvidia.com/gameworksdownload
NOTE: Make sure you download the correct version for your Tablet. WIFI, LTE-USE or LET-RoW (Rest of World). DO NOT FLASH THE WRONG ONE.
3. Download the Minimal Fastboot and ADB http://forum.xda-developers.com/showthread.php?t=2317790
4. Install the drivers for the shield from the NV download in step 2. The one PDF in the download is instructions (ish) if you need them.
5. Run the Minimal Fastboot and ADB installer.
6. Copy the contents of the fastboot folder to the NV folder from Step 2 (this is easier than editing the path for a single use).
7. Power off the tablet and connect it via USB to your computer
8. Hold down the Volume Down button for 3 seconds, press the power button and continue holding the volume down.
9. At the recovery screen you will see a menu. Look carefully. The bootloader will need to be unlocked. If it is locked see the note below. Select fastboot and press power. (I am not sure this step is required, since it returned me to the same menu, but it worked)
10. from the NV folder in step 2, double click "flash-all.bat" to flash the tablet.
If this did not work I would imagine that your boot loader is locked.
NOTE: To unlock the bootloader (Instructions are from NVidia directly)
Your SHIELD TABLET may have shipped with a locked bootloader. To update the device,
you must unlock the bootloader using the following:
- fastboot oem unlock
- Press the "Volume Down" button to select "Unlock bootloader" option on device
- Press the "Power" button to confirm the unlock. Your device's bootloader is now unlocked.
The complete instructions from NVidia (may be easier for some)
SHIELD TABLET RECOVERY IMAGE FLASHING INSTRUCTIONS
To follow the instructions in this guide, you will need adb and fastboot.
These tools are provided as part of the Android SDK:
http://developer.android.com/sdk/index.html
Before flashing this recovery image to your SHIELD TABLET, connect your SHIELD TABLET
via USB to the PC where you downloaded this recovery image.
Next, put your SHIELD TABLET into fastboot mode using one of the following methods:
SW method:
- Boot to android home screen
- Connect the device to linux/windows system
- Open terminal (on linux); command prompt (on windows).
- Type "adb reboot bootloader" in terminal/command prompt
HW method:
- Turn off the device
- Press "Volume Down" -> "Power", hold "Volume Down" and leave Power buttons till device boots
To flash this recovery image to your SHIELD TABLET, run the following commands from
the directory where you extracted the recovery image package. If this is the
first time you have done this procedure, you must unlock the bootloader (see
below):
fastboot flash recovery recovery.img
fastboot flash boot boot.img
fastboot flash system system.img
fastboot flash userdata userdata.img
fastboot flash staging blob
fastboot flash dtb tegra124-tn8-p1761-1270-a04-e-battery.dtb

Quick resolvement! Nobody could comment in the meantime.
My original K1 is stuck like a bootloop, will try this!

DizzyDee said:
My original K1 is stuck like a bootloop, will try this!
Click to expand...
Click to collapse
For a stock K1 (no custom recovery TWRP, etc.) I'd say the process outlined above is your best bet (restore stock recovery image).
I don't think you have to register to the Nvidia Developer Program anymore. Just go to the NVIDIA Download Center (as linked in the post above), find the right image, and download. Use search term "K1" and you should see the right image as one of the top few results. I believe version 5.2.0 is the last one that was released.
Once downloaded, flash the partitions using fastboot, as noted in the instructions.

[GUIDE] How to unlock bootloader on Nokia 3

*Unlocking bootloader will remove all your data!*
I'm using Windows 7, and that's the steps i did. (it should be simmilar for other systems too)
Getting code:
Code will look simmilar to this: DB1ED223C5537BA756FB0671E425D650
Method 1 (no root):
Go to
https://passwordsgenerator.net/md5-hash-generator/ copy paste serial number and click generate. Then you should see code in "MD5 Hash of your string". You can also go to simmilar md5 hash generator sites, but this site automatically converts small letters to big letters.
Method 2 (root):
Okay, this is new method that is much easier and you don't need to send IMEI and wait for @the_laser to give you code. Go to terminal emulator, type su and execute it. Then type this and execute it:
redweaver said:
Actually the command is
echo -n NE1GAM4770133666 |md5sum |tr [:lower:] [:upper:]
If you don't use the -n flag, the newline character is also passed and you get a different result
Click to expand...
Click to collapse
Unlocking bootloader:
Download platform-tools which activates adb and fastboot commands (first you need Nokia 3 driver installed if you didn't)
Nokia 3 driver: http://www.devfiles.co/download/3iK0k7Sv/Nokia_3_USB_Drivers.zip
platform-tools Windows: http://www.devfiles.co/download/KtLsN6fX/platform-tools-latest-windows.zip
platform-tools Mac: http://www.devfiles.co/download/OkrfluP0/platform-tools-latest-darwin.zip
platform-tools Linux: http://www.devfiles.co/download/vk5DudZX/platform-tools-latest-linux.zip
Enable usb debugging in Developer options before running adb. To get Developer options, go to settings, about phone and press build number 7 times. Also enable OEM unlock.
Now Connect phone to computer via usb and enable usb file transfer, run cmd as administrator, then type this command which runs adb:
chdir C:/Users/John/Desktop/platform-tools (this is just a example, you need to type your own location of platform-tools)
then type this command to check is your device connected to adb, it will show serial number of your device, if it hangs at waiting device, then you need to reinstall drivers (if you're doing this first time, then it will ask to allow usb debugging on your computer, just tick always allow from this computer and click OK)
adb devices
then type this command to reboot to recovery (you can boot to recovery by holding power on + volume up (only with usb connected) if this command doesn't works)
adb reboot recovery
when booted to recovery, choose reboot to bootloader option with volume sliders (this will boot to fastboot)
when booted to fastboot, it will show text 'FASTBOOT MODE' in down-left corner
now type this command to check is your device connected properly to fastboot.
fastboot devices
if it show characters like 0123456789ABCDEF or simmilar then it is connected properly, if it hangs on waiting device, then you need to reinstall drivers like mentioned above.
Android Nougat (7.0 & 7.1.1):
Now type these commands to unlock bootloader
fastboot.exe -i 0x2e04 oem key (type your key after oem key)
fastboot.exe -i 0x2e04 oem unlock
then press volume up, when asked
Android Oreo (8.0 & 8.1):
First download NE1-0-215H.lk.bin:
https://my.pcloud.com/publink/show?code=XZaLMs7ZclQ2wvKwSb0ofUraMmrsiHh6uk1X
Now type these commands to unlock bootloader
fastboot oem dm-verity <your_unlock_key>
fastboot flash lk NE1-0-215H.lk.bin
fastboot reboot-bootloader
Proceed your unlock procedure.
If you have problem on flashing the lk partition, you can use MTK Smart Phone Flash Tool to flash lk partition manually.
After lk partition flashed, you may encounter "Red State" when booting the phone. Ignore that and boot your phone to Fastboot mode directly with OST LA.
That is it, i tried to explain for you to understand everything i did to unlock bootloader.
Credits:
@the_laser for codes, some additional steps and corrections. Also thanks for new method. @redweaver for new method.
@Hikari_kalyx for Android Oreo method. @bigrammy for NE1-0-215H.lk.bin link.

way to enter recovery without adb -
power off phone
press and hold volume up + power on buttons, insert cable immediately
countdown will start on phone, hold both keys until countdown ends, then IMMEDIATELY release power on key, still holding volume up
you will enter recovery shortly
after installing TWRP it is very important - DO NOT allow /system modification until supersu package installation ! ( or you will require reflashing phone with OST )
another note - can't enter recovery by combination volume-up + power button, if phone not connected to computer
one man reported, that even he successfully flashed TWRP image with "fastboot flash recovery <twrp image>", he still got original recovery.
workaround is to use "fastboot boot <twrp image>" - as we need to have USB cable connected to enter TWRP recovery anyway, not big problem.

the_laser said:
way to enter recovery without adb -
power off phone
press and hold volume up + power on buttons, insert cable immediately
countdown will start on phone, hold both keys until countdown ends, then IMMEDIATELY release power on key, still holding volume up
you will enter recovery shortly
after installing TWRP it is very important - DO NOT allow /system modification until supersu package installation ! ( or you will require reflashing phone with OST )
another note - can't enter recovery by combination volume-up + power button, if phone not connected to computer
one man reported, that even he successfully flashed TWRP image with "fastboot flash recovery <twrp image>", he still got original recovery.
workaround is to use "fastboot boot <twrp image>" - as we need to have USB cable connected to enter TWRP recovery anyway, not big problem.
Click to expand...
Click to collapse
Someone told me that if you flashed twrp, that it automatically removes data encryption. Is that true?
EDIT: i find out that is not true, it asks for some password to decrypt data, but the problem is that idk what is the password

DON'T install xposed! It bootlops.
EDIT: My fault, it actually work but you need to wait more than usual to boot.

That is great guys.
Do we have a working recovery yet?

nafnist said:
That is great guys.
Do we have a working recovery yet?
Click to expand...
Click to collapse
I use this twrp https://1drv.ms/u/s!AsmTb5aqoY12mDZqDZbPOp47QVMV
I have stock recovery, but I use fastboot command 'fastboot boot recoveryname.img' when I need TWRP, and that's awesome because I don't lose stock recovery which is useful to flash OTAs and Nokia zips. I flashed SuperSu 2.79 just fine, but expect some crashes like software update, device monitor crash, but actually everything works, software update works just fine.

SkaboXD said:
Someone told me that if you flashed twrp, that it automatically removes data encryption. Is that true?
EDIT: i find out that is not true, it asks for some password to decrypt data, but the problem is that idk what is the password
Click to expand...
Click to collapse
TWRP can't handle Android 7.x default disk encryption, just press "cancel" and we need to use sdcard as storage for backups and packages because of this

Can I return the bootstrapper lock?

Where are you getting the codes from @the_laser?

abetterlie said:
Where are you getting the codes from @the_laser?
Click to expand...
Click to collapse
Yes

shokohiw said:
Yes
Click to expand...
Click to collapse
you mean to get bootloader locked again?
yes you can just instead of oem unlock type oem lock

I mean where are you getting the OEM unlock keys from?
SkaboXD said:
you mean to get bootloader locked again?
yes you can just instead of oem unlock type oem lock
Click to expand...
Click to collapse

abetterlie said:
I mean where are you getting the OEM unlock keys from?
Click to expand...
Click to collapse
idk, ask @the_laser

the bootloader I unlocked how to install root and twrp

shokohiw said:
the bootloader I unlocked how to install root and twrp
Click to expand...
Click to collapse
link for twrp
https://1drv.ms/u/s!AsmTb5aqoY12mDZqDZbPOp47QVMV
when downloaded, copy twrp to folder platform-tools and rename it to recovery.img
reboot to fastboot, then type this command:
fastboot flash recovery recovery.img
then reboot, fastboot reboot
if it didn't worked, use this command just to boot to twrp (you need to do this everytime when you are connected to PC)
fastboot boot recovery.img
To install root, first disable system modification on twrp then flash this zip for root.
This is not the latest version of SuperSU, but newest releases have some problems and crashes. (at least for me). This is last version that works for me.
That is it.

Thank you!

Is it possible after unlocking, installing twrp and root, to return the device to factory settings for ota updates? If so, how?

shokohiw said:
Is it possible after unlocking, installing twrp and root, to return the device to factory settings for ota updates? If so, how?
Click to expand...
Click to collapse
on twrp, there is a option wipe, click on it, then you will see option swipe to factory reset. then wait and reboot.
And you can now enable system modification if you want (it is recommended to enable it because some zips fails to flash because this option is disabled)

After installing TWRP and rebooting, does not want to boot Android, weighs in on the initial splash screen what to do
Your device has failed verification and may not work properly

shokohiw said:
After installing TWRP and rebooting, does not want to boot Android, weighs in on the initial splash screen what to do
Your device has failed verification and may not work properly
Click to expand...
Click to collapse
Weird, when it says your device has failed verification?
For me reboot works fine

[GUIDE] Unlock bootloader without losing user data.

Hi, I am writing this guide because many people followed other guides in the forum and lost their data. This is the proper way of unlocking the bootloader without losing your data.
0 - Read the whole guide before proceeding and proceed at your own risk!
1 - Make sure you have adb and fastboot installed on your device,
For Windows follow this guide (I suggest installing it system-wide, so that you can execute commands from every directory on your PC): https://forum.xda-developers.com/showthread.php?t=2588979
For MacOS and Linux : https://www.xda-developers.com/install-adb-windows-macos-linux/
2 - After the required tools are installed go to Settings -> About Phone on your phone and keep tapping on build number until a toast notification tells you that the developer settings are enabled.
3 - Go to Settings -> System -> Developer Settings and enable OEM unlocking option.
4 - Turn off the phone and when it's fully off, hold power + vol down button to boot into fastboot mode. When you've done this step successfully, you will see a blue FASTBOOT text on the screen with a bunny scrambling the internals of Android.
5 - Connect your phone to your PC and open a CLI/terminal/PowerShell window and type this but do NOT hit enter :
Code:
fastboot oem unlock
when you are ready to execute the command, start pressing only vol down button and then hit enter, HOLD vol down until the phone boots into fastboot mode again. This basically tricks the phone to boot into Fastboot mode instead of erase mode. To make sure the phone doesn't boot into erase mode on the next boot you need to do the following:
6 - While in fastboot mode type this into the CLI/terminal/PowerShell window but do NOT hit enter :
Code:
fastboot reboot
when you are ready to execute the command, start pressing only vol down button and then hit enter, HOLD vol down until the phone boots into fastboot mode again.
7 - Now you are ready to boot into your system. Either boot by holding power button or typing
Code:
fastboot reboot
into the terminal and hitting enter.
By rebooting twice, you make sure the phone doesn't boot into erase mode. If you flash the stock ROM beforehand and setup your device (login to Play Store), your device will still be Play Store certified by this method. But if you unlock the bootloader and the phone erases its storage, you won't be able to download apps like Netflix, because your device will not be certified by Play Store, this is because the Play Store checks for unlocked bootloaders. But by making it check the certification while it's locked and then unlocking the bootloader, you can make this issue go away. Feel free to ask for more proper guides for dummies, if you need. I have bricked my device many times and learnt by trial and error, so I'd be happy to make you avoid those same mistakes. Cheers.

No need double reboot

Os_Herdz said:
No need double reboot
Click to expand...
Click to collapse
It is not necessary, but a preventative measure. I've had instances where I hadn't rebooted twice and the phone booted into erase mode. This is a guide for people who want to make sure they won't lose data.

Another tip:
If you're with stock everything and don't want to loose data, do not boot into recovery mode (power + vol+) as it sometimes try to wipe data without any confirmation. Did happened here once, back in March 2019, but thankfully my pictures and most data are stored in MicroSD card.

RFD80M-75679 said:
Another tip:
If you're with stock everything and don't want to loose data, do not boot into recovery mode (power + vol+) as it sometimes try to wipe data without any confirmation. Did happened here once, back in March 2019, but thankfully my pictures and most data are stored in MicroSD card.
Click to expand...
Click to collapse
Can confirm, if your bootloader is unlocked and you don't have TWRP installed, booting into recovery mode will wipe the device.

marstonpear said:
Hi, I am writing this guide because many people followed other guides in the forum and lost their data. This is the proper way of unlocking the bootloader without losing your data.
0 - Read the whole guide before proceeding and proceed at your own risk!
1 - Make sure you have adb and fastboot installed on your device,
For Windows follow this guide (I suggest installing it system-wide, so that you can execute commands from every directory on your PC): https://forum.xda-developers.com/showthread.php?t=2588979
For MacOS and Linux : https://www.xda-developers.com/install-adb-windows-macos-linux/
2 - After the required tools are installed go to Settings -> About Phone on your phone and keep tapping on build number until a toast notification tells you that the developer settings are enabled.
3 - Go to Settings -> System -> Developer Settings and enable OEM unlocking option.
4 - Turn off the phone and when it's fully off, hold power + vol down button to boot into fastboot mode. When you've done this step successfully, you will see a blue FASTBOOT text on the screen with a bunny scrambling the internals of Android.
5 - Connect your phone to your PC and open a CLI/terminal/PowerShell window and type this but do NOT hit enter :
Code:
fastboot oem unlock
when you are ready to execute the command, start pressing only vol down button and then hit enter, HOLD vol down until the phone boots into fastboot mode again. This basically tricks the phone to boot into Fastboot mode instead of erase mode. To make sure the phone doesn't boot into erase mode on the next boot you need to do the following:
6 - While in fastboot mode type this into the CLI/terminal/PowerShell window but do NOT hit enter :
Code:
fastboot reboot
when you are ready to execute the command, start pressing only vol down button and then hit enter, HOLD vol down until the phone boots into fastboot mode again.
7 - Now you are ready to boot into your system. Either boot by holding power button or typing
Code:
fastboot reboot
into the terminal and hitting enter.
By rebooting twice, you make sure the phone doesn't boot into erase mode. If you flash the stock ROM beforehand and setup your device (login to Play Store), your device will still be Play Store certified by this method. But if you unlock the bootloader and the phone erases its storage, you won't be able to download apps like Netflix, because your device will not be certified by Play Store, this is because the Play Store checks for unlocked bootloaders. But by making it check the certification while it's locked and then unlocking the bootloader, you can make this issue go away. Feel free to ask for more proper guides for dummies, if you need. I have bricked my device many times and learnt by trial and error, so I'd be happy to make you avoid those same mistakes. Cheers.
Click to expand...
Click to collapse
When I type fastboot oem unlock and press enter, a screen shows on the device to select unlock or do not unlock. Then what?

softgadget said:
When I type fastboot oem unlock and press enter, a screen shows on the device to select unlock or do not unlock. Then what?
Click to expand...
Click to collapse
It shouldn't ask you to unlock phone or not in fastboot mode, as what I did unlocked mine for months ago. It should return you to fastboot mode in a flash (a fraction of seconds) and manually restart your phone by holding up power button until you'll see unlocked warning and AndroidOne logo.
If it is, try to select "unlock", but your data may wipe afterwards.

RFD80M-75679 said:
It shouldn't ask you to unlock phone or not in fastboot mode, as what I did unlocked mine for months ago. It should return you to fastboot mode in a flash (a fraction of seconds) and manually restart your phone by holding up power button until you'll see unlocked warning and AndroidOne logo.
If it is, try to select "unlock", but your data may wipe afterwards.
Click to expand...
Click to collapse
I am running Android 10 latest update on my Mi A2 and my phone shows a screen to select Unlock or Not to Unlock options. It is in fastboot mode. What is the problem?

softgadget said:
I am running Android 10 latest update on my Mi A2 and my phone shows a screen to select Unlock or Not to Unlock options. It is in fastboot mode. What is the problem?
Click to expand...
Click to collapse
You have another device. This is for Mi A2 Lite, not Mi A2. And on top of that, it works for Android Pie. I don't know for stock Android 10 since we (Mi A2 Lite users) don't have it yet (as of my writing).

RFD80M-75679 said:
You have another device. This is for Mi A2 Lite, not Mi A2. And on top of that, it works for Android Pie. I don't know for stock Android 10 since we (Mi A2 Lite users) don't have it yet (as of my writing).
Click to expand...
Click to collapse
Oh. OK then.thank you

I downgrade to oreo and now when power om phone show message that is bootloader unlocked, so can lock again bootloader to remove that message without lost data or must live with that? If can do that, how? I forgot to say after flash oreo bootloader was locked, but i must unlock again to fix sim cards.

popadic022 said:
I downgrade to oreo and now when power om phone show message that is bootloader unlocked, so can lock again bootloader to remove that message without lost data or must live with that? If can do that, how? I forgot to say after flash oreo bootloader was locked, but i must unlock again to fix sim cards.
Click to expand...
Click to collapse
You can unlock with the same method. But I believe you will flash a zip from TWRP to fix SIM cards and that will break your phone if you lock the bootloader. So after fixing the SIM cards, you need to leave the phone unlocked, otherwise phone will be bricked. If you want to get rid of the ugly splash screen, you can flash a custom splash you can find in the forum.

marstonpear said:
Can confirm, if your bootloader is unlocked and you don't have TWRP installed, booting into recovery mode will wipe the device.
Click to expand...
Click to collapse
So after unlocked the devices, it's recommended to install TWRP to avoid this right ?

gusbalaa said:
So after unlocked the devices, it's recommended to install TWRP to avoid this right ?
Click to expand...
Click to collapse
You can leave it as is, but don't ever boot into recovery if you value your data from Internal Storage or if haven't backed up data to MicroSD.

RFD80M-75679 said:
You can leave it as is, but don't ever boot into recovery if you value your data from Internal Storage or if haven't backed up data to MicroSD.
Click to expand...
Click to collapse
I think I'm gonna install TWRP for safety, my data is already on MicroSD.
EDIT : Is possible to install TWRP & Root without losing data / need to flash Decrypt ?

gusbalaa said:
I think I'm gonna install TWRP for safety, my data is already on MicroSD.
EDIT : Is possible to install TWRP & Root without losing data / need to flash Decrypt ?
Click to expand...
Click to collapse
You don't need to decrypt. You can install TWRP and flash Magisk through TWRP.

marstonpear said:
You don't need to decrypt. You can install TWRP and flash Magisk through TWRP.
Click to expand...
Click to collapse
Thanks, already done it.
Flashed TWRP & Magisk without losing any data.

marstonpear said:
Hi,
Click to expand...
Click to collapse
will this metode also work on mi10

-fluffy- said:
will this metode also work on mi10
Click to expand...
Click to collapse
I'm not sure but probably not. Because Mi 10 is a MIUI device and this is an Android One. Still you gotta try to make sure, but the risk is all yours. Cheers.

marstonpear said:
Hi, I am writing this guide because many people followed other guides in the forum and lost their data. This is the proper way of unlocking the bootloader without losing your data.
0 - Read the whole guide before proceeding and proceed at your own risk!
1 - Make sure you have adb and fastboot installed on your device,
For Windows follow this guide (I suggest installing it system-wide, so that you can execute commands from every directory on your PC): https://forum.xda-developers.com/showthread.php?t=2588979
For MacOS and Linux : https://www.xda-developers.com/install-adb-windows-macos-linux/
2 - After the required tools are installed go to Settings -> About Phone on your phone and keep tapping on build number until a toast notification tells you that the developer settings are enabled.
3 - Go to Settings -> System -> Developer Settings and enable OEM unlocking option.
4 - Turn off the phone and when it's fully off, hold power + vol down button to boot into fastboot mode. When you've done this step successfully, you will see a blue FASTBOOT text on the screen with a bunny scrambling the internals of Android.
5 - Connect your phone to your PC and open a CLI/terminal/PowerShell window and type this but do NOT hit enter :
Code:
fastboot oem unlock
when you are ready to execute the command, start pressing only vol down button and then hit enter, HOLD vol down until the phone boots into fastboot mode again. This basically tricks the phone to boot into Fastboot mode instead of erase mode. To make sure the phone doesn't boot into erase mode on the next boot you need to do the following:
6 - While in fastboot mode type this into the CLI/terminal/PowerShell window but do NOT hit enter :
Code:
fastboot reboot
when you are ready to execute the command, start pressing only vol down button and then hit enter, HOLD vol down until the phone boots into fastboot mode again.
7 - Now you are ready to boot into your system. Either boot by holding power button or typing
Code:
fastboot reboot
into the terminal and hitting enter.
By rebooting twice, you make sure the phone doesn't boot into erase mode. If you flash the stock ROM beforehand and setup your device (login to Play Store), your device will still be Play Store certified by this method. But if you unlock the bootloader and the phone erases its storage, you won't be able to download apps like Netflix, because your device will not be certified by Play Store, this is because the Play Store checks for unlocked bootloaders. But by making it check the certification while it's locked and then unlocking the bootloader, you can make this issue go away. Feel free to ask for more proper guides for dummies, if you need. I have bricked my device many times and learnt by trial and error, so I'd be happy to make you avoid those same mistakes. Cheers.
Click to expand...
Click to collapse
Wowwww! Thank you very much, time ago I've unlocked the bootloader without losing any data
That's a very good solution

BMAX MaxPad_i11 Bootloader Unlock w/ Unisoc T618

All files can be downloaded from the iplay40 tread. MUST use iPlay40 fastboot version or else it will fail using commands.
Download install SpreadTrumTools-20200317.apk
run command -- adb shell getprop ro.serialno
Enter the serial you get from your tablet and HIT generate your own signature.bin file
run command --- adb reboot bootloader
In fastboot mode -
enter command -- fastboot flashing unlock_bootloader signature.bin
Press volume down to confirm bootloader unlocking, all user data will be erased.
wait til done -- success and enjoy
Note - can take up to 5-10 mins to unlock bootloader and earse user data, be patient

After adb reboot bootloader, mine reboots, says it's in fastboot mode and continuously vibrates, non stop. It won't accept the next steps after that.
Only way out is to keep the power button pressed until it reboots.
So can't unlock bootloader.

How To Guide [Relock Bootloader realme gt neo 2]

Requirements:​-Make sure that your device is charged to at least the 60%.
-You should also have installed the Deep-Testing Tool.
-Enable USB Debugging on your device. You need to enable this so that your device is recognized by your PC in the ADB mode.
Instructions Steps:​1. Download and install the deep-testing app. For Android 11 DeepTestApkOld, For Android 12/13 DeepTestApkNew.
2.Launch it on your phone and tap on "Apply to exit in-depth tests", by pressing the green button.
3.Boot device on Fastboot mode */Power off your device and then press and hold the Power and Volume Down keys for a few seconds.
4.Download and install the adb programm on your pc.
5.Go to "C:\adb" folder and type "cmd" over the address bar, it will launch the Command Prompt.
6.Enter these commands:
"adb reboot bootloader"
"fastboot flashing lock"
7.At this point in time, you should see a confirmation message on your device. Use the Volume keys to highlight and select the Unlock the Bootloader option and hit the Power key to confirm it.
8.Go over again the Command Prompt and type "fastboot reboot".
Conclusions:
That is it, now you have re-locked the device bootloader, leave a reply down below if you have any problems whit that.

Thanks, just did you said and locked the bootloader

Hi, I have a problem... Just bought Realme 9 Pro plus, any version of Deep test not working, i'm on RMX3393_11_C.06. Any hope for unlock bootloader ? Maybe flash other firmware can help ?

Try to downgrade the firmware version from Realme Ui 3.0 to 2.0.

Is It a Global Rom?

Thanks for replay Yes global. Before update, on Ui 3.0, same behaviour. Deep Scan no recognize the device. And can't enter to Fastboot. Recovery works. How i can downgrade without Fastboot ?