Your friend might now more than I do - what do you think?
I wouldn't put my c*ck-on-the-block and say Messiah boots everything, but I would simply say that Messiah boots everything except badly made copies. Nobody has reported anything to the contrary nor even hinted at it.
So, again without going C-O-B, the Messiah is 100% compatible with SCPH 30003 PAL PS2, v4/v5 to my personal knowledge, v3 by virtue of the
www.china-messiah.com site diagrams.