New method IMEI and network repair done on i9505....Real direct solution. No need for root, 2 seconds operation.

Use c3300k UART cable
*#7284# Set UART to MODEM
*#9090# Set DM over UART (Phone will reboot)

Press "repair button", fill the IMEI.

LOG:
Code:

Selected model: I9505
Selected port: COM18 Z3X BOX Serial Port
Selected port speed: 115200
Checking phone at COM18
Repairing IMEI... OK
Repairing network settings... OK
Reseting... OK
Repair done
Done with Samsung Tool v.15.1

All ready tested..