heres why. the pandora battery or even the official jigkick battery, is checked upon by the IPL. it then finds it discovers the battery is there then boots it up. it then checks the memory stick for the file. so if sony changes the IPL just a slight bit. then newer FW's wont be able to use this. would it be really easy for them to patch this. im no expert but i was thinking they could pretty easily do this.
EDIT: fixed a spelling error.