try mo boss downgrade 4.1..
sir follow this
http://www.redmondpie.com/how-to-do...05.13.04-baseband-for-unlock-and-working-gps/
for firmware punta ka dito
https://ipsw.me/
[ERROR];347785 said:baka merin kajan sir 4.1 pasensya pbaguhan lang po sa iphone bihira kase dito mga ganyang unit