Well congratulations to the dev job well done. here is some money but oh wait no paypal
the best guess i can estimate is he reverse engineered the 3.7 eboot and noticed that the eboot from uncharted 2 was very similer and change a bit of code here n their and copy 3.55 eboot with 3.7 loader strings and poof we have working eboot
^^i dont know this and is an estimation i made up to give my self clarification.
Coming from the guy that does not know how to use punctuation correctly as for me i cbf it's a forum