Most, or many, posts comes with a big warning.

But, perhaps, making a pinned post stating the dangers of God mode ?

Can we save the SBL from live phone for backup?

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

Jolla C partition:

parted /dev/mmcblk0
GNU Parted 3.1
Using /dev/mmcblk0
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: MMC Q823MB (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 67,1MB 134MB 67,1MB fat16 modem
2 134MB 135MB 524kB sbl1
3 135MB 135MB 524kB sbl1bak
4 135MB 136MB 1049kB aboot
5 136MB 137MB 1049kB abootbak
6 137MB 138MB 524kB rpm
7 138MB 138MB 524kB rpmbak
8 138MB 139MB 786kB tz
9 139MB 140MB 786kB tzbak
10 140MB 141MB 1049kB pad
11 141MB 143MB 1573kB modemst1
12 143MB 144MB 1573kB modemst2
13 144MB 145MB 1049kB misc
14 145MB 145MB 1024B fsc
15 145MB 145MB 8192B ssd
16 145MB 156MB 10,5MB splash
17 201MB 201MB 32,8kB DDR
18 201MB 203MB 1573kB fsg
19 203MB 203MB 16,4kB sec
20 203MB 237MB 33,6MB boot
21 237MB 1390MB 1153MB ext4 system
22 1390MB 1423MB 33,6MB ext4 persist
23 1423MB 1692MB 268MB ext4 cache
24 1692MB 1725MB 33,6MB recovery
25 1725MB 1727MB 1049kB devinfo
26 1745MB 1745MB 524kB keystore
27 1745MB 1746MB 524kB config
28 1746MB 15,6GB 13,9GB userdata


(parted)

Interresting - so, the C have backups of the critical partitions.

What are they good for if you delete their table too

Teaching people who shouldn't be messing around, the hard way.

No that's the task of what follows if you mess with them

However - what are the backup partitions good for, can the primary ones get corrupted? Is it used for some ongoing check against?

It's probably the recovery method since we know it will be different to that on the JPhone due to lack of Btrfs.

That doesn't help you, but as you found out if you aren't super careful when running fdisk as root you can break things :P

One of the most important rules of the internet is that nobody has ever read a sticky.