ive recentley purchased avic 900bt i got it hardware bypassed but it doesnt work right wen i hit 60 + it says its stricly prohibbted i have tried everything to make it work even tryin to go bak to 1.9 jus wont work any suggeestions on how to do the software update like step by step with a link to download windows for the unit thanks for the hlep also is der anything that i cud be doing wrong ?