Hey guys i lost my password...and i have downloaded Super test mode key and also about 3 other test mode keys... I cant get my avic f900bt to boot into test mode I already put the green cable in the back with the black to do the e brake by pass... I have a 16gb micro SD with the SD card slider so I can use it on the avic I also format it to fat32 if anybody can point at what am i doing wrong i can appreciate it also if i was to update the radio would i still have to put in the password thanks in advance any help would be greatly appreciated...

When i take it out of the put the card on my computer it shows a gps folder. And something else so i giess is reading the sd card

I was in the same boat as you with regards to my password. My unit is an SPH-DA120 and I had no choice but to send it to Pioneer. 

I never could get the unit to boot into testmode. Wish I could help but I never could figure it out.