How to Unlock Bootloader on Umidigi Bison and Bison GT

Pre-Requisites

• Charge your device up to 50% or more before unlocking the bootloader
• A PC and a USB cable to connect the phone to the system
• Always remember to take the backup of your device data.

Instructions to install

1. You need to enable the developer option to activate OEM unlock and USB Debugging
2. To enable the developer option, Go to your Settings -> About phone -> Now tap on the Build Number 7-8 Times until you see a toast message “You are now a developer!“
   
3. Go back to settings -> Now you need to enable the OEM Unlock by going to Settings -> Developer Option and Enable OEM Unlock and USB Debugging
   
   
4. Download and Extract the Downloaded ADB fastboot Zip file on your PC.
5. Now connect your phone to the computer using a USB Cable.
6. When you connect your Phone to Computer, please wait until all the drivers get installed.
7. In your ADB fastboot folder open a command prompt window by pressing Shift Key + Right Mouse Click
8. Now type the command in your command window

   adb devices

9. If you see a pop up to allow USB Debugging on your phone, Click OK
10. Now type the command below to reboot your phone to bootloader

    adb reboot bootloader

11. Once your phone reboots into bootloader, make sure your phone shows the bootloader locked and then type the command below to make sure fastboot drivers correctly installed.
12. Now enter the command given below to verify whether your device is been connected properly to PC.

    fastboot devices

13. This command will list the connected devices. If your phone’s serial number shows up, you are good to go and may continue. If the phone is NOT listed, this indicates that your drivers are not installed correctly. To keep the setup, you must fix your drivers to list your device under fastboot devices.
14. If the phone is recognized by the command above, proceed to boot into bootloader by tapping down the volume down button on your phone and select the BOOT TO DOWNLOAD MODE option with the power key. Now you can unlock the bootloader with the following command: Remember that this step will wipe EVERYTHING off the phone.

    fastboot flashing unlock

15. Notably, if this command does not work you can try to use the below command:

    fastboot oem unlock

16. You will get a confirmation on your Android device’s screen, Navigate to yes and hit the Power button to unlock the bootloader of your device.
17. Once the bootloader is unlocked, your smartphone will automatically reboot into bootloader mode.
18. Now again you can enter the command to reboot your device to the system

    fastboot reboot

19. Your Android device will now reboot and during this, all data will be erased.
20. That’s It!

That’s all you have to do to unlock the bootloader on Umidigi Bison / Bison GT. Now, your phone is ready for all kinds of customization like rooting and you can use custom ROMs as well.