MODEL NUMBER: GT-I9300
BASEBAND VERSION: I9300XXELLA
BUILD NUMBER: JZO54K.I9300XXEMMA2
Search and read for how to view your CSC, dial *#1234# in dialler should do it.
If your phone is undamaged in anyway then flashing an official stock rom won't break anything, but will enable OTA updates.
However, if your phone has been messed with then any firmware after EMG4 will break network connection.
Chose the latest firmware for your own country, the country of origin is immaterial.
Sent from my GT-I9300 using Tapatalk
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