ColinAttica

Recently found my old GX and while i've lost all my old account details and wouldn't know where to begin finding them, i decided to create a new account. I've installed monkey and the line manager,however when i go in to register my device again, i can't do it. I have no available serial number and it has rubbed from the bottom. Surely there must be some way around this as i have already purchased this item and i'm point blank refusing to pay for another serial key. Can anyone help please?