[Q]Wanting to keep Recalled Shield!

I got my replacement tablet and my old tablet never deactivated itself. It has no recovery installed, and it isnt rooted. A friend of mine wanted to buy it so I said sure. Problem is, I factory restored it with no recovery still. And now when I power the tablet on, i cant enter fastboot mode, and the tablet freezes every time I start it up. Ill be able to unlock it for a sec and then the screen freezes then I have to hold to power to turn it off. I just want to know why it keeps freezing and if there is any way I can fix the problem.

~Thanks ahead.