Hey everyone, I'm fairly new here. I picked up an 05 Avalanche to yank the 5.3 from. The Pcm is service# 12589463, hardware# 12589162. I can't seem to find an XDF file for the 9162 OS. Can I write over the OS with the 2004 year 7063 OS? This may seem like a stupid question, but I just don't want to brick my Pcm by doing something wrong.