PJ1115 is probably right but he could be equally wrong and these commonallity bits could be the way the eboot is encrypted. It does make sense as it would lead itself to a very sophisticated encryption algorithm. I looked at the addresses and offset and cant find a pattern there will be an algorithm to work out the next common bit value and offset but of course unless your sony... you dont know it! Im not sure who is right maybe we are both wrong. Im not sure. What I will do over the weekend is try to use the Kazuo eboot structure and transpose the loco roco demo over the top of it leaving in the common bits. If this works I reckon they common bits are the encryption key! Of course Im really clutching at straws here but lets see wot appens! I dont have much time for messing with psps at the mo due to work but I will try fit it in!