A good idea to do so, helpful I believe once its figured out how to extract the needed files.

The partitions of J1 is like this, not sure of C.



Model: MMC MAG2GC (sd/mmc)
Disk /dev/mmcblk0: 15.6GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number Start End Size File system Name Flags
1 17.4kB 4194kB 4177kB emgdload
2 33.6MB 67.1MB 33.6MB QOTP
3 67.1MB 71.3MB 4194kB Qfa
4 71.3MB 75.5MB 4194kB Qcfg
5 75.5MB 79.7MB 4194kB Qdlog
6 79.7MB 81.8MB 2097kB Qvariables
7 81.8MB 83.9MB 2097kB Qlogfilter
8 101MB 105MB 4194kB fsg
9 134MB 185MB 50.3MB ext4 Qglog
10 185MB 189MB 4194kB modemst1
11 189MB 193MB 4194kB modemst2
12 193MB 195MB 2097kB sbl1
13 195MB 197MB 2097kB sbl2
14 197MB 199MB 2097kB sbl3
15 199MB 201MB 2097kB tz
16 201MB 203MB 2097kB rpm
17 203MB 206MB 2097kB aboot
18 206MB 273MB 67.1MB fat16 modem msftdata
19 273MB 281MB 8389kB ext4 drm
20 281MB 294MB 12.6MB boot
21 294MB 306MB 12.6MB recovery
22 306MB 315MB 8389kB pad1
23 315MB 323MB 8389kB misc
24 323MB 856MB 533MB linux-swap(v1) swap
25 856MB 864MB 8389kB ext4 persist
26 864MB 864MB 8192B ssd
27 864MB 872MB 8389kB security
28 872MB 15.6GB 14.8GB btrfs sailfish