mobile

Hello everyone, recently my friend wants to update his S3 android from 4.1.2 to 4.4, but however the OTA software update shows that the newest update has been installed :(
How can he get an update of android of his S3? His phone information are as below :) , please ignore the Chinese characters :)
Btw he wants to try UPSM on his phone, does he need to root his phone :confused:

Please help me :D

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