steps to create new btrfs filesystem for a Jolla phone

gistfile1.sh

1. On a phone that's still working:
    mount -o subvolid=0 /dev/mmcblk0p28 /mnt/

2. On a Linux laptop:
    ssh jolla tar c /mnt/factory-@ >factory.tar
    ssh jolla tar c /mnt/factory-@home >factory-home.tar

3. On the working phone again:
    umount /mnt

4. On the laptop:
    dd if=/dev/zero of=new-jolla.img count=28831711
    mkfs.btrfs --label sailfish --nodesize 4096 --features ^extref new-jolla.img
    sudo mount -o loop new-jolla.img /mnt
    sudo btrfs subvolume create /mnt/factory-@
    sudo btrfs subvolume create /mnt/factory-@home
    sudo btrfs subvolume create /mnt/@swap
    cd /
    sudo tar xf ~/factory-home.tar
    sudo tar xf ~/factory.tar
    sudo btrfs subvolume snapshot /mnt/factory-@ /mnt/@
    sudo btrfs subvolume snapshot /mnt/factory-@home /mnt/@home
    sudo btrfs subvolume list /mnt

5. Note the ID of the @ subvolume in the output of the previous command and substitute 260 here:
    sudo btrfs subvolume set-default 260 /mnt
    sudo btrfs-show-super new-jolla.img

6. Note the fsid in the output of the last command and substitute the second hex number here:
    sed -i -e 's/0f8a2490-53ed-4ff6-ba34-b81df3430387/f6f0da16-fd3e-48b6-b785-cc9af653b055/' /mnt/@/etc/fstab   
    sudo umount /mnt

7. Upload the new filesystem image new-jolla.img to the non-working phone in the recovery mode and write it to /dev/mmcblk0p28, sync and reboot -f. Install updates to get back to the latest SailfishOS version.

I think step 6 needs to be modified, to modify both /etc/fstab of factory-@ and @. If factory-@'s UUID is left default, restoring the device from recovery mode will cause bootloop due to mismatch of UUID. For step 7, if you don't have large microSD card to host the image, recovery contains 'nc' and using it will be fine. Just make sure that your USB connection is stable.

I have a fried jolla, and a working one so I have always wanted to see how to clone mi working one to fix the dead one.

I am guessing step 1 is for the working phone connected to the linux computer and those are shell commands or am I supposed to do those steps in the dev mode shell IN the phone?

Cheers

Hi,
Thank you for the post.
What should i do if I don't have a working Jolla and my phone is bricked.
Is there a way I can download and use the filesystem jolla.img to use on my phone in recovery mode?

Couple of fixes and extra instructions:
on step 4, second line needs to be -->
mkfs.btrfs --label sailfish --nodesize 4096 --features ^extref,^raid56,^skinny-metadata,^no-holes new-jolla.img
or at least I ended up with "invalid arguments" and "unsupported features(100)" without those additions.

on step 6, I used nano to replace the UUIDs, from both fstab as peremen instructed.

on step 7,
To use the nc, type from the ubuntu:
dd if=new-jolla.img | nc -l 3333

and after that from recovery shell in jolla:
nc 10.42.66.67 3333 > /dev/mmcblk0p28