Hi giuseppe, the only thing I did was follow the steps that Dr Mong wrote a little higher, you get off the 2003 version, to put it in SD, you have to format a FAT32 SD and record whatever you want, as long do the same. Installs, then get off the 2004 version that are 2 files, paste thefolder to overwrite the 2003 version and installed this version in the 920bt.
Finally, to install the maps you put the 3 files from the SD 1 and SD to install, it will ask for a password that is "passwordpassword" and are already installed. To update the bluetoothfirmware put the folder in the SD 2 SD, and install it.
It is best to follow in the footsteps of Dr Mong is best explained step by step. # 68
how do I download software from linksave map, I need to register or is there a torrent link?