Bootloader unlocking
1) Activate the item "For Developers" in the settings. To do this, click several times on the "Build number" in the "About Phone" menu.
2) Turn on "Factory Unlock" in the "For Developers" settings.
3) Install the driver
MTK_Driver_Auto_Installer_SP_Drivers_20160804.exe(8.87 MB)
4) We connect the smartphone and activate "USB debugging" in the "For Developers" settings, if a message about debugging permission appears, set the "always allow" checkbox and enable.
5) Download and unpack
platform-tools.zip(2.4 MB)
Attention!
After unlocking the bootloader all settings
and user data in the internal memory will be deleted!
SD card is not affected.
Therefore, first make a backup of your data!
6) In the folder with the unpacked archive platform-tools run
1-reboot-bootloader.cmd The device should reboot into fastboot mode.
(Perhaps at this stage there will be a request for debugging permission, we allow it and if the smartphone does not reboot into fastboot we run
1-reboot-bootloader.cmd .
7) Run
2-unlock.cmd , we will be prompted to unlock the device by agreeing to pressing the Vol + key
8) After successful unlocking, restart the device by holding the Power button.
You can check the unlocking in the "For Developers" settings and each time you turn it on, it says that the device is unlocked.
EVERYTHING YOU DO WITH YOUR DEVICE, YOU DO AT YOUR OWN RISK!
BEFORE WHAT TO DO THAT, THINK: DO YOU NEED IT?
AND DO NOT FORGET ABOUT BACKUP!
P.S. You need to unlock the bootloader to install third-party recovery and firmware.