Got the latest Manjaro XFCE 21.10 downloaded while the Pinebook Pro was running of an SD card with Manjaro on it.
Used the Manjaro Flasher to flash image onto eMCC.
Pinebook booted ok a few times.
Now it displays the Manjaro boot logo with the spinning circle.
Pressing ESC I get the following message:
ERROR: Device ‘PARTUUID=091 …’ not found. Skipping fsck.
Mount; /new_root: can’t find PARTUUID=091…
You are now being dropped into emergency shell.
Sh: can’t access tty; job control turned off.
After a few boot attempts it may start up.