Need help with using Code Breaker or Game Shark on NullDC

[crimsonedge]

I followed the YouTube tutorial, but the codes from cmgsccc don't do anything. I tried it with Sonic Adventure 2 (like in the video). I noticed that the dc screen/window will stay on the pause screen if I do not select Start within 10-20 seconds from the time I Pause the emu. The sound still plays like normal, but the screen doesn't show what's happening. I managed to quickly do the Pause->Start step, and the screen wasn't frozen, but the codes didn't do anything. I tried using inf. rings and inf. lives. I did this while on an actual stage (after hitting the Start button on my controller to get to the game's pause screen). Even after I died on the level, nothing changed. Am I doing something wrong with the steps?

Thanks.

I believe it was Chankast Cheater I used on NullDC back when I was more into DC emulation. I know for a fact it worked on Skies of Arcadia, but it might not work on every game. If they had it working on Sonic Adventure 2, then maybe you did something wrong or forgot to check a box, or properly apply the codes. Some games have a master code that must be input for any of the codes to work, did you put that in? Also I am not sure if or how compatible these codes are with CDI ripped games. All of the codes I tried were on full GDI versions. If your version of Sonic Adventure 2 is CDI, you might want to get the GDI version, and try the codes on it.

On second thought I remember trying codes on a CDI version of Grandia II, and they didn't work, but when I tried them on the GDI version they did work.