UMD recognition

Well i am playing Yu gi oh gx tag force 3 and i need help getting the umb recognition stuff to work . I heard of the Cwcheat method but once i changed the iso and get my cards , i cant access my com again.Something like:
1.Go to umd recog on ygh 3
2.turn on cwcheat and enable usb
3.replace the iso with the same name
4.Exit cwcheat without(i tried with too) turning off enable usb
5.Get my cards
6.If i nvr turn off enable usb , when i tried to drag a file into my mem stick nothing happens , if i turn off enable usb and turn it on when i am done to put the proper ygh 3 back , my com could not detect the mem stick( or rather nothing happens/changes)

Anyway theres nothing wrong with my usb , i did not unplug it in the whole process and tried it numerous times. My psp was also changed to np9660(not sure what it really is called).
It wud be best if someone could make a save data for me instead of teaching me how to do it actually XD

EDIT : Ok , i solved it by using two mem sticks.