Taken From The GameFAQ
I've cracked the game, now how do I play it?!
Play the game now, it will load and run like any other. If you're happy with the speed you can ignore the rest of this page. Otherwise, read on.
The updated RDB is supplied with this game set to use Project64's Interpreter CPU core. This is because the Interpreter is needed to get through the intro added to the game by the patch. However, the actual game runs fine on the Recompiler, therefore, after you have gone through the intro once, you may use the Recompiler from there on, for better performance.
Step-by-step instructions for:
running cracked Jet Force Gemini on the recompiler:
Start your cracked Jet Force Gemini game as normal.
Wait for the Dextrose intro to clear, and the game's title screen to appear. In between you will get a "Reading from flash ram status..." error message; just press OK.
Make a state save (F5)
Go to ROM Settings (CTRL+S, ROM Settings tab)
Change Interpreter to Recompiler.
Press OK.
Reset the ROM and pause emulation immediately (press F1 then F2 in quick succession). If you are too slow, you will get an Unhandled Opcode error message, just do this step again, quicker!
Load your state save (F7)
Unpause the game (F2)
Play!
The next time you want to play Jet Force Gemini, repeat steps 1 then skip to 6-10 (you only need to do steps 2-5 the first time you play).
