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Searching for network error GT-i9300

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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



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?



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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.

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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?

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