[Q] Galaxy S3 stuck at boot. Failed to mount Data, failed to mount EFS
Hello, I have a Galaxy S3 (GT-I9300) phone that is not feeling so well.
On startup it freezes indefinitely on the Samsung boot logo.
I am able to get into recovery and download mode.
In recovery I get errors - unable to mount Data, and unable to mount EFS.
The phone is recognized by the computer, both in Kies and Odin so flashing is possible.
It is not rooted and completely stock. Problem is that I don't know what version firmware it had.
There is unbacked information on the phone I'd like to recover.
What I've tried: Within Kies>Firmware upgrade and initialization (second option under tools) I enter the model number and then the serial, but I just get a message along the lines of "please check your model" (I entered GT-I9300).
The phone is generic international version from 2012, untouched (version-wise) since.
I very much appreciate any idea that might fix this. How can I find the right firmware? will it erase my memory? how can I restore the EFS partition?