I think you have to dig on this one,

http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=1576#Post1576

Code:
In case of the dm7025 this means:

primary boot source : cf [/autoexec_dm7025.bat ]
secondary boot source : flash

In case of the dm800 this means:

primary boot source : usb [/autoexec_dm800.bat ]
secondary boot source : flash

In case of the dm800se this means:

primary boot source : usb [/autoexec_dm800se.bat ]
secondary boot source : flash

In case of the dm8000 this means:

primary boot source : usb [/autoexec_dm8000.bat ]
secondary boot source : flash

In case of the dm500hd with USB modification this means:

primary boot source : usb [/autoexec_dm500hd.bat ]
secondary boot source : flash


As the autoexec file will jump to where to boot, so the /hdd

and download the MEGA file, as probably you have tools and infos about how to do all this,

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