What is BootLoader?
BootLoader is a small program that runs before the operating system kernel runs. Through this small program, we can initialize the hardware device and establish a memory space map to bring the system's hardware and software environment to a suitable state, in order to prepare the correct environment for the final call to the operating system kernel. In an embedded system, there is usually no firmware like a BIOS (note that some embedded CPUs also embed a short startup program), so the entire system's load-start task is completely done by the BootLoader. For example, in an embedded system based on the ARM7TDMI core, the system usually starts at address 0x00000000 on power-on or reset, and the BootLoader program is usually arranged at this address.
Unlock the bootloader
The first step: unlock the bootloader (will delete all the data on your SD card, please backup all the data on the SD card).

Turn off the phone, press and hold the volume up button + power button, hold for about 5 seconds, release, the phone screen display enters the bootloader interface.

Start installing the driver

Connect your phone to your computer with a USB cable, right click on My Computer > Administration > Device Manager.

Right click on the unrecognized "Android 1.0" device and select "Update Driver"; choose to install the driver manually.

Select the x86/usbwin directory (64-bit system x64/usbwin) and continue to install it all the time.

In the middle of the way, you may choose whether to continue the installation. Select Yes. After the installation is successful, the system can recognize your phone as an Android Phone.

Please pay attention to the text on the Bootloader interface. If it is displayed as "LOCK STATE - UNLOCKED", it means it has been unlocked.

Skip the following steps and go directly to the second section to recover recovery. If the display is "LOCK STATE - LOCKED", continue to the next step.

Double-click the unlock.bat file in the fastboot directory on your computer. (If your computer does not display the file suffix, double-click the unlock file)

The phone will display the unlock prompt interface, press the volume button to select YES, and then press the power button to confirm.

Ok, the bootloader has been unlocked, showing "LOCK STATE – UNLOCKED"

Restart the phone, connect the computer, and put the compressed package su-2.3.6.1-ef-signed.zip in the root directory of the phone.

When finished, turn off the phone, press and hold the volume up button + power button, keep it for about 5 seconds, release, the phone screen displays into the bootloader interface, plug in the data cable, connect the computer

The second step is to install Recovery.

Install Recovery from your computer

Double-click the flash_recovery.bat file in the fastboot directory on your computer.

After the file is executed, the recovery is already cleared, and the Bootlader interface after the unlocking is continued.

Enter the last step

In the Bootlader mode, select RECOVERY and confirm, (volume key selection, power button confirmation) the phone restarts into the main interface of the Recovery mode.

In the Recovery interface, press the volume up and down keys to select "install ZIP from sdcard", then press the power button to confirm and enter the submenu, then find choose zip from sdcard, confirm and find the "su-2.3." stored in the memory root directory. 6.1-ef-signed.zip" file, a menu for you to confirm, select "Yes" to start the installation.

Wait a moment, after the installation is complete, select "+++++Go Back+++++" and confirm,

Return to the main interface of Recovery mode. Select "reboot system now" and confirm, it will automatically restart the phone, there will be an "authorization management" program in the program interface after booting, this means that the root has been compromised.

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