This image OpenBlackHole-0.4-vusolo_usb
modify to work on dm500hd-original-A8P
(i dont have test on anther multiboot BUT with obh 0.4 on flash openmultiboot works with openatv 5.3 - openpli4 and base images on multiboot , from line : Turn off your receiver and take off usb stik and follow .....)
i have install obh 0.4 on multiboot but stay on openmultiboot interface when dreambox boot, if i want to boot on obh 0.4)
this image is big and install it on flash ONLY with flashexpader
1)On zip there is nfi file to flash it
when flash image ,go plugins and install flashexpader on ext4 usb.
after reboot edit /etc/fstab and mount usb stick as /usr.
reboot (/usr directory have move to usb)
2)on extra zip folder there is two folders with the name of directory to move the inside folders.
3) reboot , enjoy
UPDATE your own risk WORKS