Hello everyone i am in a peculiar situation i recently got s3 from my friend he said that it is I9300 but when i received it i came to know that it is T999 and not I9300 . My problem here is it came with android version 4.1.1 build number : I9300ZSEMC1 i didn't understand why it came with i9300 firmware ( i cannot ask my friend as he does not have much technical knowledge ) everything is working fine occasionally touch does not respond and i have bit of hard time switching on wi fi and weird battery drain problems what i want to know is , is these because of the i9300 firmware being present in t999 and whether is it advisable to update it further from 4.1.1 version to t999 latest stock firmware or to stick with the present version . If it is advisable to update to t999 based stock firmware i want to know whether it will work in indian carriers and wont have any problems and also can someone guide me for the right firmware link / build number to go with. :fingers-crossed: