It's quite easy if u know how to patch. Download the EditPES4OptionFile0.6 tool from any site and open your PES4's option file, then edit the stats of players as u wish. After editing, go to the File menu and select "Create para_we8.bin". Save the file in a folder and use AfsExplorer to open 0_text.afs in ur PES4 dir. Find the "para_we8.bin", and import the created para_we8.bin. (Sometimes, u need to reconstruct the afs file to have space for the file). After this, just update the afs file and replace the original. Go into PES4 and start a new master league, the modified stats will work.