postmortem

Hello friends. Is there a way to unlock a previously flashed SD card after being inserted into the player? I have an AVH-Z9250BT with boot issues, I flashed an SD card with the 4400nex firmware, and it boot perfectly, every functions works fine, except the AM-FM Radio, I tried to reflash the SD with another firmware, but it apear Access Denied error, and I can't format or reflash the same memory. I'll apreciate any help