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WE ARE NOT RESPONSIBLE IF YOU SHOULD CRASH YOUR BOX THIS WAY! THERE IS NO WARRANTY THAT THIS WILL WORK!
IT WORKED WITH ALL THE BOXES WE HAD SO FAR. BUT WE'VE ONLY TRIED THIS ON THE NOKIA-BOXES NOT THE PHILLIPS ! THE SAGEM WON'T WORK !!

Well before you can do anything else you have to enable debugmode in the bootloader.
The bootloader will only accept and boot BetaResearch Firmware with a correct 128bit crypto-signature in normal mode. In debugmode it will accept and boot EVERYTHING without a valid signature !
Here's a HOWTO [german] [english] how to turn on debugmode. You also need the miniflsh package. Enabling the debugmode WILL NOT STOP THE original soft working. It won't change anything than give you more access on the software.

That's all for now if everything works now you can boot any other software at any time you wish. :)