Patching eboot whats required?

Hi I have a few newer game such as F1 2011 amongst others that do not boot from original disc on my CFW 3.55 kmeaw with multiMAN_v1.15.00, it prompts for a update, I want to know the following.

Others have said that a replacement eboot is required similar to the method used on PSP, I would like to know how to modify my own eboot in the case a pre patch eboot is not available, I believer that it’s a mater of hex editing, I may be wrong.

Please provide a guide or link to one if available that explains what is required to be patch in an eboot to work on older FW.

Thanks in advance

Update found what I was looking for hare on PSX Scene in Game Backup EBOOT . bin repository


Thanks