Games like ready 2 rumble round 2 and nhl 2001 will not load with a neo2.2 on a US v4 console without the use of the EA swap or a patch. Some EA games must be swaped without the CPU knowing it and you cannot do this with a v5 console. I will attempt to explain this and yet make sense

On a v4 console you can press and hold the reset button for the tray to eject for 5 sec then close automatically. This is not supported with the v5 as pins 3,5 and 6 are not used. Pin 3 sends a pulse to the BA5810FP chip telling the PS2 that the tray hasnt ejected when it actually has. One of EA's protection was to use a file in the pressed originals boot data to load. This file cannot be copied by cd writer or ejected into the console by the neo2.2 chip. It must come from a original game or boot disc. When you press eject on a v5 with a neo2.2 it still has pin 2 to send the SCE signal and it has pin 7 to check for PSX,PS2 format but it doesnt have pin 3 to send the pulse to fool the CPU so this file gets lost when it ejects the tray to swap the disc and the CPU resets, the backup will not load.... Hope this makes sense to some of you so i dont get flamed to death

However most of this info can be confirmed at
www.chipzone.com.