Mid-last week, I finally decided to stick a custom rom on my old, laggy Galaxy S3. Up until this point I had been running on stock 4.1.2 Firmware, rooted, with things like Bloatfree cleaning the device up a bit.
I did some research and landed on the latest Paranoid Android build, based on 4.4.4. All was rosey for a little under a week with no problems whatsoever until this Monday afternoon. I was doing nothing other than opening Snapchat when my S3 turned itself off, only to get stuck on the bootscreen.
It took me all day yesterday just to get the thing to boot again, I must of tried 4 different stock roms, searching for ages to find CWM that would flash via Odin and any fix just to get it past boot. After finally getting it into Recovery it kindly let me know that "E:Failed to Mount /EFS".
Since that happened I have managed to get the phone booted up into a stock 4.3 rom, exited factory mode and got it rooted with busy box and terminal. It has become a WiFi-only Tablet, essentially.
I am at the last hurdle, where I have no network connectivity and my IMEI is wrong. I of course have my correct IMEI on the back of the phone which I wish to reintroduce to the phone. I do not have an EFS backup.
- Phone on Stock 4.3 ROM SGS3INT-XXUGMK6-BTU-20131216, rooted with busy box, root explorer and terminal. Always had stock kernel.
- IMEI incorrect, with no backup of EFS.
I have tried:
- EFS Professional - EFS Format errors on mount read/write
- NVitems_reader_writer, though I can not get my device to stay in RMNET + DM + MODEM mode to be able to connect via COM port as a serial device.
- A few of the other simpler methods from the forums
Any help is much appreciated, and while I have read that modifying the IMEI number is frowned upon and illegal practice, I am simply trying to restore it to it's original state, no tom foolery here.