after MANY tests
this is the story:
I install on flash the last openatv-5.0 for dm500hd. (delete language that no use)..
Format a usb stick ext4 and mount as /media/usb.
From plugins menu download and install openmultiboot and open it,when ask for module-kernel-mdt.... install it.
Open again openmultiboot plugin and whe ask show the usb for install and exit .
NOW DON'T REBOOT FROM OPENMULTIBOOT PLUGIN - reboot normal from image menu.
When boot can you see the openmultiboot interface with -openatv 5.0 (flash)- and receiver boot normal.
Turn off your receiver and take off usb stik and follow this :
Put it on linux laptop ,download http://linuxsat-support.com/showthread.php?t=37099.
more details : put the files from extract in /media/mount-usb/ ,edit unpack-nfi.sh to work directory /media/mount-usb/, change /image to /open-multiboot, and /image/image1 to /open-multiboot/name-image
Put this image http://www.mediafire.com/download/b2...0150620-GS.nfi or the last openpli 4.0 dm500hd on /media/mount-usb directory.
open terminal in /media/mount-usb/ directory and type ./unpack-nfi.sh .
(open all directories as root)
Now put usb again in receiver and power on.On openmultiboot interface you can see and anther images select the new and press OK.
YOUR RECEIVER REBOOT ON NEW MULTIBOOT IMAGE.
CHANGE YOUR MULTIBOOT IMAGES OR FLASH ONLY FROM MULTIBOOT INTERFACE ON BOOT - NOT FROM OPENMULTIBOOT PLUGIN
I have test it with openatv on frash, and OBH-0.1 - openlpi 4.0 on multiboot.(with my dm500hd-A8P)
WORKS PERFECTLY.
if you want try it with your own risk
(ALL THOSE IS FOR DM500HD-dm800se-ORIGINAL-A8P)