I think I installed another unit's update or a bad file onto my z120bt..... I've been trying to fix it for months. I can play a disk that's already in there when i have either my sd or usb in with condhack on it. Otherwise, it just says no applicable program. I've tried to place updates on my SD but it just says update starting but quickly states that "update failed" and restarts. It continues to play through that lil sequence over n over in a loop and it's quite stressful. On boot up it says 2013 instead of 2009 as before. I do not have User files or NDATA files on unit anymore for one reason