When I first got it it was able to play my AVI and MKV movies from the external usb drive (500GB). But after I upgraded the firmware to the latest one: P70R2 the MKV movies would play fine but the AVI wouldn't play properly, it kept giving me this error: Unknown Start Code.
I decided to play around with it and decided to copy the AVI file to the internal hard drive (500GB) which I installed. It played perfectly. Did upgrading the firmware on the PBO messed up something on my external USB drive?
Since this issue I have downgraded and even used alt. firmware and the issue still exists. So it's not the firmware or the PBO i would assume. I would reformat my hard drive if i could, but I dont have anything to back up my movies too.