Gameshark 2 V2 - Playstation 2

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My PS2 can't read the GameShark memory card, does anyone know how to fix the issue? : r/ps2

GameShark: Cheat Codes 2 V1.1 – NeverDieMedia

Gameshark (Playstation 2 / PS2) – RetroMTL

GameShark PS2 Greatest Hits: 465 Codes for 10 PS2 Games (2005, Volume 1) : Video Games

Gameshark 2 Prices Playstation 2

Found this in one of the PS2 systems I purchased. What is it? Looks like it is missing a disc. Is the dongle worth keeping? : r/ps2

Gameshark 2 V2 for Playstation 1 (PS1) Code Archive Disc, Disc Only Tested

Got a GameShark for ps1 and don't have a memory card : r/Gameshark

GameShark Bundle for Sony Playstation 1 and PS2 for Sale in Los Angeles, CA - OfferUp