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Download ROM. After downloading, put the downloaded ROM file into the root directory of the mobile phone memory card.
Brush in the recovery program: in the off state, press and hold "Volume Down"+"Home"+"On/Off" to enter the recovery mode. Select "Apply Update from sdcard", then locate the downloaded recovery file and confirm the brush-in. After brushing in, restart the phone.
Clear the data. After successfully swiping the card for recovery, press and hold the "HOME key"+"On/Off key" to enter recovery mode, select "Erase data"-"Restore factory settings", then click "OK" to erase the data, select "Erase cache partition" and confirm to clear the cache.
Select "Install zip from sdcard" in the recovery interface to install the brush program from the memory card, and select the rom file of the memory card to confirm the installation.
Upon completion, you will return to the initial interface of recovery, select the first item "Restart the system immediately" to restart and enter the new system, and then complete the process.