I have started playing with the solder pads just above the AD6833KB (main CPU of the livebox) shown on http://www.i2bp.com/images/Livebox003.jpg . I suspect this is a JTAG connector (and the pads just above right could be interresting too, maybe a console port or something ?). Using my multimeter (wish I had an oscilloscope), I have hopefully half-guessed the role of most pins and have soldered cables to them.

Meanwhile, i have ordered a JTAG interface (http://www.virtualvillage.fr/programmateur-jtag-interface-testeur-circui... damn cheap), and will soon be in the process of try-and-fail to match the livebox pads with JTAG ports.

This are really going slow, lack of time and lazyness are the main causes.