Hey Pedro,
The "No AV Information" message is usually if you have your headunit on AUX In mode - which is used for the Camera feeds (I have two reversing cameras mounted on my car feeding back to the head unit). If you have no signal going in, you can get that error.
My SD Card image is completely factory, minus the UK .fbl map (which isn't the original). The only file altered was this file as I started my car one day and the .fbl came up as corrupt. This is where my problem started.
One thing I have found that has been the only thing contrary to all of the excellent facts that FBF has given us, is that on this particular headunit, if you don't use the correct basemap.fbl, the thing doesn't even try and load the Nav platform, so if you pull the basemap.fbl from my archive, you might get it to start loading at least and you can pick up from there. I have been mad busy and unable to get on to this for the last few days but I will be picking it up next week again. I'd just be happy with a standard igo8 image with no audio, but I can't even get that to go.
/<ilomike