Guest mmalik Posted June 24, 2015 Report Share Posted June 24, 2015 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 Link to comment Share on other sites More sharing options...
Guest taife32 Posted June 24, 2015 Report Share Posted June 24, 2015 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. Link to comment Share on other sites More sharing options...
Guest mmalik Posted June 25, 2015 Report Share Posted June 25, 2015 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? Link to comment Share on other sites More sharing options...
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