How to repair Samsung i9300 4.3 Network not Register ?
Before repair we must to know why the Samsung i9300 4.3 Network not Register problem, the problem had accour becouse baseband lost or kernel not suitable when flashing or downgrade also costum room.
To fix this problem just flashing back only baseband modem and kernel.
We can fix it by updater via samsung kies for optimally working. but these one is the fast way to do that just searching suitable baseband and kernel for flashing manual only baseband modem and kernel.
Below File to repair modem and kernel Samsung i9300 Android Ver 4.3
Download File Size 19.MB
Extarct and put the file in MMC then instal baseband modem and kernel via CWM Recovery
Many Phone Success Repairs by Me and NOW You :D
Read also done repair with z3x Box more links here