Sony Xperia Z Ultra Tab SGP311 andorid update file offline firmware update file just download it from the descritption install driver and run flash tool connect tab in flash mod and flash it. after flash it will take little time so dont worry just wait little. tutorial update.
this is test on a old 4.4 firmware and flashed from 4 to 5.1 sucessfull so its a tested file.
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| Sony Xperia Z Ultra Tab SGP311 update 5.1 |