Guys!! Serious problem here!!
My bro in law's note 2 went into a bootloop after an auto restart during playing CoC,
btw he's using official stock rom FNI1 build + rooted
- it's a bootloop, so i'll try clear caches and dalvik cache, still cannot be fixed
- do a factory reset (full wipe) still not fixed
then I notice in recovery screen got show "E: failed to mount /efs (invalid argument) "
So I believe the EFS partition cannot be read for a reason,
- then I tried re-flash the same build stock rom thru odin, did not fix the efs not mounted issue, and phone is still bootloop
so I google, they say it's the mount point for efs went wrong, need to fix thru adb commands
- I did everything adb shell thingy to fix the mount point for efs, finally fixed and it's mounted, phone can now boot normally just fine!!
now... new problem "Emergency Call Only", his phone can no longer connect any Telco network, the sim card confirmed no problem, so I check IMEI and baseband info, basedband ok, but imei become generic 004999010640000 which is not valid and different than phone's original.
now this is the problem, I don't have his phone's EFS backup, also couldn't backup EFS since the phone is not usable because bootloop.
How can I restore IMEI without its original EFS backup???
His phone is screwed
Sifu please help...
Good that you can fix the error via ADB, that's a reasonable amount of skill there