Como reparar uma partição ext4 severamente danificada?

Question

Eu tenho um SDCard que tem uma partição ext4 que foi gravemente danificada, se eu tentar montar, ele gera:

mount: mount /dev/mmcblk0p8 on /media failed: Stale file handle

Esta é a informação do superbloco:

tune2fs 1.43.3 (04-Sep-2016)
Filesystem volume name:   root
Last mounted on:          <not available>
Filesystem UUID:          7014450b-327d-4a3e-a78a-d072ef01a6fe
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file uninit_bg dir_nlink extra_isize
Filesystem flags:         unsigned_directory_hash 
Default mount options:    user_xattr acl
Filesystem state:         not clean with errors
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              522240
Block count:              2085632
Reserved block count:     104281
Free blocks:              2015490
Free inodes:              522229
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      509
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8160
Inode blocks per group:   510
Flex block group size:    16
Filesystem created:       Wed Dec 31 21:02:02 1969
Last mount time:          n/a
Last write time:          Thu May 18 15:07:55 2017
Mount count:              0
Maximum mount count:      -1
Last checked:             Wed Dec 31 21:02:02 1969
Check interval:           0 (<none>)
Lifetime writes:          260 MB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               256
Required extra isize:     28
Desired extra isize:      28
Default directory hash:   half_md4
Directory Hash Seed:      11e9ced2-8cb0-436b-aaca-16a2cfb7cb32
Journal backup:           inode blocks

Mais informações:

file -s /dev/mmcblk0p8
/dev/mmcblk0p8: Linux rev 1.0 ext2 filesystem data (mounted or unclean), UUID=7014450b-327d-4a3e-a78a-d072ef01a6fe, volume name "root" (errors) (extents) (large files)

O comando fsck falha o tempo todo com:

e2fsck 1.43.3 (04-Sep-2016)
root contains a file system with errors, check forced.
Resize inode not valid.  Recreate<y>? yes

Posso tentar algo mais para recuperar a partição, sei que posso rodar o photorec, mas gostaria de saber se ainda conserto a partição ...

UPDATE

O resultado do dmesg tem muitas mensagens como esta:

[dom may 14 17:18:28 2017] mmcblk0: error -110 sending stop command, original cmd response 0x900, card status 0x900