shift6mq: postmarketOS installed on SD card (dual boot android)

Let’s describe my current 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) Installation: I’ve followed the instructions at https://wiki.postmarketos.org/wiki/SHIFT_SHIFT6mq_(shift-axolotl) . Enter Fastbootd and ensure it is working as expected: $ # Set "a" as active slot and…