I have a avic-n3 and I have used this forum with success, I recently purchased a used F900bt and It didnt come with a sd card. Can I make this card from a generic sd and a download.

I tried a couple mods but now my unit is booting to wince with sd card in. without sd card inserted unit black screens itself

well i hope you made a back up before starting any mods, and if the SD card has the testmode files on it, it will always boot to the windows screen, if it doesnt boot up corectly with out the card in it, then you have made a mistake and bricked up your system.

use the test mode files to boot into windows and then replace your files with the back up ones that you should have made before starting any mods.

also this is more of a hacks thread, so you will probably get more help in that section.