I tried a direct update to Rogero.. no luck

Now i wanted to load a downgrade hex but when i opened the PCgrade zip i saw a whole list of hexes. I have no idea which one should i use
UPDATE:
I found a list of jailbreak devices that have the same chip as mine cant put the link here damn
the chip is PIC18F2550
So one of those hexes should do the trick. Any advice?