iPad 1st Generation Error 1602...

Hey guys I've got a problem. I have this iPad 1st Generation 32GB with Cellular Service that I got. Bought from someone who couldn't fix it for cheap and now I know the extent of why he sold it to me. The iPad is in a constant boot loop and no matter what it won't stop. So I decided I would just do a restore and try to fix the issue that way. Nope, I get the error...

"The iPad "iPad" could not be restored. An unknown error occurred (1602)."

The more I research the topic all I come across are sketchy youtube videos where you have to download certain software off of sites that seem suspect. I've used 3 different computers including my MacBook and nothing seems to work. If you guys have any clue on how to fix this issue let me know. Obviously this iPad is a bit old by todays technology standards and can only run up to iOS 5.1. If you can help me out that would be great, thank you!