Download and unpack the program SP_Flash_Tool on your computer
[*] Download and install USB VCOM drivers.
[*] Unpack the archive with the factory firmware for your smartphone (the directory to the unpacked folder with the firmware files should not contain Cyrillic characters).
[*] Turn off the smartphone. The cable is not connected to the computer.
[*] Remove and insert the battery back.
[*] (skip if drivers are already installed) Connect the phone to the computer with a cable. The operating system will find a new device - specify the system folder with the USB driver VCOM (for its version of the OS). If something does not work with the installation of drivers, then read the instructions provided above for installing drivers.
[*] (skip if drivers are already installed) Disconnect the cable from the computer.
[*] Click the Download button.
[*] We connect turned off phone to a computer cable. The program should see it and start flashing. If your phone is not detected, disconnect it from your computer, remove and reinsert the battery and reconnect to your computer. In Device Manager, when correctly installed drivers at the time of the firmware should com port monitor mtk usb port (MediaTek PreLoader USB VCOM Port). A finishing EEPROM or in the event any error is disabled and the device disappears from the device manager.
[*]
Manual installation of drivers for VCOM firmware
go to the computer under a user with administrator rights
[*] press the key combination - Windows + R (the Windows button is between the left Ctrl and Alt)
[*] write in the mmc devmgmt.msc window (or devmgmt.msc) (the Device Manager will open)
[*] take out the battery from the smartphone, and then return the battery back (do not turn it on)
[*] we connect the smartphone to the computer with a cable
[*] right-click on the new device in the Device Manager. If a device with a yellow triangle appears in the "Android Composite ABD Interface" section, then install the adb driver on this device. If not, then the spoiler above has instructions for manually editing this driver. And if a device appears in the com-ports section or in unknown devices with the name "MT65xx Preloader" or "MTK usb port", etc. follow this instruction further.
[*] in the menu that appears, click Update Drivers
[*] we are looking for a driver on the computer (for example, if you unpacked the archive with the current drivers, then look for the folder for your operating system and point to the usb2ser_ file "OS version and bit depth is indicated here"). Choose a driver for your operating system.
[*] depending on the questions click further / OK / agree
[*] drivers are installed on win8 and win8.1 with signature verification disabled.
[*] Disabling signature verification on win8 is done like this:
[*] Win + I ->Change computer settings ->Are common ->Special download options ->Reload now.
[*] When shutting down, click Diagnostics ->Extra options ->Boot Parameters ->Reboot.
[*] After the menu appears, select "Disable mandatory driver signature verification".
[*] Next, install the drivers according to the instructions.
[*] Disabling signature verification on win8.1 is done like this:
[*] Win + I ->Options ->Change computer settings ->Upgrade and Repair ->Recovery ->Reload now.
[*] When shutting down, click Diagnostics ->Extra options ->Boot Parameters ->Reboot.
[*] After the menu appears, press F7 and wait for the computer to restart.
[*] Next, install the drivers according to the instructions.
[*]
Installing ADB drivers
Turn on debug mode on the device.
[*] 1. Turn on debug mode on the device.
[*] 2. Run AdbDriverInstaller.exe on the computer.
[*] 3.Connect the included device to the computer (the device should appear in the program list).
[*] 4. Click install.
[*] 5. Ready.