Searching for network error GT-i9300

[Guest mmalik]

Decided to update my phone and have now come across the problem above.

 

These are the steps I took before flashing the new rom.

 

Format and factory reset

Wipe cache

Dalvik wipe

 

Flash new rom

Reboot

 

I have tried 4.4 Kitkat, 5.0 and 5.1 Lollipop Roms and all give me the same above error. Keep polling and looking for Mobile network service provider (Three). I did some googling and forum searches and have tried the following suggestions.

 

Switch off phone

Remove sim

Airplane mode

Remove and reinstall APN details

 

I have also reinstalled all new roms at least twice with the same error.

 

If I reinstall my backup, phone works fine.

 

I also have the latest CWM.

 

Can anyone help/advise?

 

Thanks

[Guest taife32]

If while running the problematic roms you go to About Device and see if the phone still shows IMEI number. I suspect it won't, I think when you formated you might have lost the EFS folder. When you run your backup everything is returned to normal.

[Guest mmalik]

Hi,

 

Thanks for your reply and yes, you are correct. When I go to "about device" nearly everything is "unknown" and serial number is not correct either. How can I get around this?