The FAQ is available on the OS section (of every box), with the OS file when you download it. From Win7 you will need to flash twice the file as the first time it erases the OS on the sim card, and the second time it will update with the new OS you want to load. On WinXP it does all at once.

For example for here are the links where you have the details,

DM800HDseV1 : http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=364#Post364

DM800HDpvr : http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=339#Post339

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