If you want to go online with patched games there are a few things you'll have to do.
you'll need two programs: disc id utility and disc id inserter.wich can be found in these links:
Burn the image of disc id utility to a cd/ dvd, wich you prefer.run the utility with your moddedps2, or use swap magic to run the program on your ps2. Put your
retailversion of pes5 in your ps2(it has to be retail, cause every retail version of pes5 has it's own unique disc id).Put your retaildisc in your ps2 after loading disc id utility and press X.now the program gives you your pes5 disc id.write it down.
Now you'll need your patched iso image of pes5 on your pc(I'll take it that you have already patched your pes5image).Open your image with apache or winimage. Go to the directory "iop". Now extract the file
dnas300.img[B/]. Now open the extracted file with disc id inserter. Press scan. Then insert your disc id written down earlier.press patch. now insert/overwrite your patched dnas300.img with the original one in apache or winimage. Now burn the pes5 image to a dvd and your done
. I know it sounds really difficult, but it's really not that hard