Unhappy [Q] 3g bug

hi developers,
iam from india . i have updated my xperia t l30p using official update from sony. its firmware is 4.3 now. but the problem is i cant connect to any 3g network.i could connect to a network only in GSM mode wcdma only mode (=no network). Also some minor bugs are there. i have called sony care. since i havent bought it from india they cant give service to my phone coz this phone is not released in india. then i tried flashing it with 4.4 rom then roll back to 4.1.2 rom, i successfully rooted the phone flash it with a rom from here, but the only problem is 3G IS NOT WORKING. i desperately need 3 g for my downloads. what should i do???