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[Completed] Need Help Unlocking Bootloader.

I have a Micromax A290 [Canvas Knight Cameo] which is rooted. I have installed adb and fastboot drivers in my PC running Windows 8.1. I am trying to unlock the bootloader of my device.
So I connect the device, type "adb reboot bootloader" and the phone boots into fastboot mode.
Next, I type "fastboot oem unlock" to unlock my bootloader.
The phone asks me for confirmation and I go for Yes.
Here is the problem.
After I choose yes, a message comes up in my device saying this:
"BOOTLOADER UNLOCK FAILED. RETURNING TO FASTBOOT IS 3s..."
I have tried everything I know. Used a different cable, used another port, but to no avail.
Please help me.
Thanks in advance.

Tiks_Baralous said:
I have a Micromax A290 [Canvas Knight Cameo] which is rooted. I have installed adb and fastboot drivers in my PC running Windows 8.1. I am trying to unlock the bootloader of my device.
So I connect the device, type "adb reboot bootloader" and the phone boots into fastboot mode.
Next, I type "fastboot oem unlock" to unlock my bootloader.
The phone asks me for confirmation and I go for Yes.
Here is the problem.
After I choose yes, a message comes up in my device saying this:
"BOOTLOADER UNLOCK FAILED. RETURNING TO FASTBOOT IS 3s..."
I have tried everything I know. Used a different cable, used another port, but to no avail.
Please help me.
Thanks in advance.
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Hi and welcome to XDA.
I couldn't find much information about your device here except this thread http://forum.xda-developers.com/android/general/tutorial-micromax-canvas-knight-a290-t2872896. Try posting your query there or in Android Q&A,Help and Troubleshooting. Experts there may be able to help you.
Good luck

Stuck after unlocking bootloader?

Hi everyone,
Today I decided to root my Mate 9.
I started out with turning 'OEM unlock' on and usb debugging. With ADB installed and the huawei drivers, I began to unlock my bootloader. On the 'EMUI Huawei' homepage I filled out my device details and obtained an unlock code. I opened ADB and checked with 'adb devices' if my device was there. It was. So I continued with typing 'adb reboot bootlader'. After that I typed 'fastboot devices'. My device was still showing up. I typed 'fastboot oem unlock CODE (with the code). On my screen I pressed 'Yes'. Bootloader unlocked.
After this step I tried to flash twrp with the command 'fastboot flash recovery xxxx.img'. I couldn't continue because every adb/fastboot command keeps failing (remote: command not allowed). Now when I boot up my phone it shows 'your device has been unlocked and can't be trusted'. Phone=unlocked, FRP=locked. I can't do anything.
Device: Mate 9 L29C432B198
What did I do wrong or what did I missed? :crying:

I had this issue at first to had to redownload the original rom via the phone recovery this will fix the frp lock then u have to unlock and flash twrp 3.1.01 that is linked in the threads on here

Did it format after it unlocked?
You can try fastboot oem relock UNLOCKCODE
Then go to Settings -> Dev options -> enable OEM Unlocking
Then unlock again.
It probably will fail though if FRP is locked, but worth a shot.
Edit: It's supposed to say
PHONE Unlocked FRP Unlock

Unable to unlock Bootloader of Meizu m6 m711h

I have meizu m6 m711h with:
Android 7.0
Flyme 7.1.2.0G
I am trying to unlock its bootloader but adb is not recognize the device.
Tried with different drivers pdaNet method as well but no success.
Can someone guide me how to unlock the bootloader ? Want to install a good custom rom in my phone.
Update:
I have managed to boot into fast boot mode now adb is recogaizig the phone and fastboot as well but, when I use fasboot oem unlock it does not work.
online tutorials says I should find OEM Unlock option in developer options to make fastboot oem unlock work but there is no such option in developer options.

Hi!Yes,I'm late,but want to say that we can't unlock bootloader on this device. Company"Meizu" don't give this opportunity. Many users from other forums have tried to unlock,but all attempts have failed. OEM Unlock option is absent.

Mi unlock tool not detecting the device

Guys,I was using Miui now I wish to unlock the boot loader and install custom
But the mi unlock tool is not detecting the device
Tried adb devices..it's detecting the phone but the fastboot devices is not detecting the phone..and the device manager either in when phone is in fastboot
Help guys
Nb:installed latest drivers,windows 10

Did you find any solution?, i am stuck in a similar situation please help me out

1st of all: To unlock the bootloader you have to accept the OEM unlocking from the developer settings (if you dont know how to access them google it)
2nd: while in fastboot on the fastboot driver execute the command " fastboot devices"
the output should be something like xxxxxxxx fastboot
If the pc or mi unlock tool doesnt see the phone the change your fastboot &/or adb drivers
If it still doesnt recognise it then you should change cable or go to a technician to fix the phone.

[SOLVED] Lenovo VIBE K5 A6020a41 Bootloader refuses to unlock

EDIT:
fastboot boot and fastboot flash WORK even though
fastboot oem device-info shows thebootloader is NOT UNLOCKED.
If that still doesn't work try to flash some other compatible stock rom for your model with qfil and try the fastboot boot and fastboot flash commands again, don't care about unlock status, it worked for me successfully flashed twrp and a custom rom.
Hello!
My Lenovo VIBE K5 A6020a41 refuses to unlock its bootloader.
Output of fastboot oem unlock:
FAILED (remote: 'oem unlock is not allowed')
I have enabled developer settings, usb debugging and Unlock OEM setting.
I found some posts of people with the same issue and smartphone model and they said they fixed it by flashing another stock rom (they didn't specify which).
I have flashed two or three other stock ROMs with QFIL, one was for A6020a40 model and the other two were for my A6020a41 model.
Again, I enabled all the necessary settings and still couldn't unlock my bootloader, showed the same error.
Then I tried flashing TWRP through QFIL, but when I rebooted into it, Lenovo logo showed for a second and then a black screen forever, I also tried to see if adb was able to detect it as a device in recovery, but it didn't.
Then I managed to root it with KingoRoot(I know it is not secure and it is bad and all, but I just want to flash a custom rom anyway), so I installed the official TWRP app and an app called Flashify, both flashed TWRP successfully, but I couldn't boot into the TWRP again, Lenovo logo for a second and a black screen.
Do You have any suggestions please?
Thank You.

Try
Code:
fastboot flashing unlock
what is the appropriate command on newer devices.

jwoegerbauer said:
Try
Code:
fastboot flashing unlock
what is the appropriate command on newer devices.
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Click to collapse
Already did. This device supports the older one only. (Should support)

Hint: Add " Lenovo VIBE K5 A6020a41 " to front of this thread's title.