Help! My phone becomes unbootable suddenly It is Samsung Galaxy Note 2, unrooted.
I factory reset my phone to stock ROM about a week ago. Suddenly it became unbootable today. I didn't do anything risky. If my memory serves, I simply updated an app one day before this incident.

It always stuck at the Samsung Galaxy Note 2 logo screen.
I can boot to recovery mode and download mode.

The following errors displayed when I booted to recovery mode:

Android system recovery &lt; 3e &gt;
KOT49H.N7100ZSUFNL1

E:failed to mount /efs (No such file or directory)
E:failed to mount /system ((No such file or directory))

# MANUAL MODE #
--Appling Multi-CSC
E:failed to mount /system (No such file or directory)
can't mount '/system' (No such file or directory)
E:failed to mount /cache (No such file or directory)
can't mount '/cache' (No such file or directory)
E:failed to mount /cache (No such file or directory)
E:can't mount /cache/recovery/last_recovery
E:failed to mount /data (No such file or directory)
E:can't mount /data/log/recovery_log.txt
E:failed to mount /system (No such file or directory)
E:failed to mount /cache (No such file or directory)
E:can't mount /cache/recovery/log
E:can't open /cache/recovery/log
E:failed to mount cache (No such file or recovery)
E:Can't mount /cache/recovery/last_log
E:can't open /cache/recovery/last_log
E:failed to mount /cache (No such file or recovery)
E:can't mount /cache/recovery/last_install
E:Can't open /cache/recovery/last_install
E:failed to mount /cache (No such file or recovery)


I tried to wipe cache partition. It didn't help.

How could I backup data in this case?
I just need to get back my photos.

How could I fix and restore my phone?

Please help. Thanks a lot.
Maybe you cant get your photo back. Try to flashing your phone with odin. Its work for me with samsung galaxy s4 later month ago.

There is file system that missing in your android rom, and you should flashing it.