Prepare a card above MICRO SD 2G, and the MICRO SD card has enough space to put the rom system file package.
Connect the mobile phone to the computer and copy the rom file package to the MICRO SD card.
Hold down the volume up and down keys at the same time, and then press the power button. If the volume up and down keys are pressed continuously for more than 10 second, the mobile phone will automatically trigger the SD card upgrade operation.
Another method is to copy the rom package to the sd card, and then insert the sd card into the mobile phone.
And enter the "Settings" menu of the mobile phone, and select "Settings-Mobile Phone Upgrade-System Software Update-Local Upgrade".
Wait for the phone upgrade to be completed, and it will automatically restart after the phone upgrade is completed. Do it.
After the mobile phone is upgraded and restarted, you can check the system version number through "Settings" and "About Mobile Phone" to confirm whether the mobile phone has been upgraded successfully.