PPS. I uploaded a screenshot of "printenv" here.

I have changed:
- "user-nvramrc?" to true, to use the saved "hd" alias (see below)
- "skip-netboot?" to true, to skip that part (save some seconds?)
- "boot-command" to "hd:,\\bootinfo.txt", to force booting on MorphOS

I have also changed the alias for "hd" to "/ht/pci@7/k2-sata-root/k2-sata@1/disk@0" so that "dir hd:,\\" can access/list the content of the boot partition.

Still no luck When starting the G5 without touching anything, MorphOS doesn't boot, and the G5 just shows a gray screen with nothing happening. When going into OF and typing "bye" or "boot" or "mac-boot", the G5 boots into MorphOS...