iPhone 4 help!

Well, we seem to have come full circle. That didn't take long.
https://forums.macrumors.com/threads/1517400/

Lets see if we can get further this time

Well, hopefully braddick will let us know what he tried exactly, so you don't need to do it all over again. But I suspect you'll have to get into inside your phone and start testing components.

Wish I could help, but I just mailed the winner of my eBay auction his iPhone4 yesterday so the timeline is impossible as for being the same iPhone.

I can give you a shortcut though:
Error -1 is a hardware issue and I honestly think there is very little if anything you can do on your end to get it back up and running again.

Perhaps I missed a YouTube video or two, but that was my (lengthy) conclusion.

Better luck to you!

Could you take it to apple and get an out of warranty replacement

^
Apple offered me that, but on a Sprint iPhone4 8GB the $160. charge Apple wants sort of exceeds the value (when you couple in what the broken iPhone could be sold for).

Now, if it was AT&T and a 16GB (or better) model, that would make more sense.