This is an update of https://www.janwagemakers.be/jekyll/postmarketos/shift/2025/09/18/shift6mq_sdcard_postmarketos.html where I describe my dual boot setup between postmarketOS and android on my shift6mq shift-phone.

• Slot A: postmarketOS /boot with rootfs on SD card (mmcblk0)
• Slot B: android (shiftOS-G 5)

This is mostly ment as a documentation for myself… I’ve found an easier way to update my /boot partition when there is a kernel upgrade.

# update pmbootstrap
cd ~/git/pmbootstrap/
git pull

pmbootstrap pull
pmbootstrap init
pmbootstrap install
cd ~/.local/var/pmbootstrap/chroot_rootfs_shift-axolotl/etc
vim fstab
# replace line with / ext4 with (UUID-->SD card)
# UUID=4540a2ee-6dc5-4294-8b24-a479b95836df / ext4 defaults 0 0
pmbootstrap flasher flash_kernel --partition boot_a
pmbootstrap shutdown
fastboot reboot