Download any ROM available in this blog and extract its contents somewhere in your PC and then open that folder and run Rom update Utility (ruu) and follow the following steps...
Download OS image from here
Un-zip the file and execute RUU program.
Follow instruction on your PC
complete check box and "NEXT"
On process will show your device current ROM version
choose "UPDATE
Confirm your ROM version and new update version then choose "NEXT"
Click "Next" to proceed.
Read the information from pop-up message and the OS update procedure will takes 10 minutes long.
You can see the update progress from your PC and in your device.
The OS upgrade is finished, click "Finish" to close the utility.
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