ok, so here is the update. since installing G900I firmware failed through odin due to bootloader incompatibility i managed to install it through mobile odin. worked like a charm and even had the telstra bootanimation lol. wifi, bluetooth and everything seemed to be working fine. however my gps is still not working and the G900I seems to have the same gps.conf file as the euro version. i definately believe my gps module is either faulty or not connected to the board properly. is there any app that can tell if the gps module is even there or turned on as no one else is having this problem.
I think you should send your phone to your carrier customer service, they will sort out your gps issue