You likely entered the wrong code type. PS1 GameShark codes usually start with 80 , 30 , or D0 . Do not use Action Replay codes interchangeably.
Note: The "swap trick" can damage your console’s spindle motor if done constantly. A modchip is safer. Download Gameshark Lite Ps1 Iso
: Insert the burned GameShark CD into your modded PS1 or use the "disc swap trick" (taping down the lid sensor) to bypass the boot check. Enter Codes : Use the on-screen menu to select your cheats. Physical Swap You likely entered the wrong code type