iphone will not work... at all

[cjkawng]

alright. i just finished reading through 35 different help posts related to this, and have yet to find a matching problem.
I purchased this iphone from my friend, who just got a new one and sold me his old. he had used winpwn to jailbreak/unlock...ect.
He did the reset on it so it would erase all his stuff. (he told me he reset it, when he gave it to me all i seen was the apple symbol with a little progress bar.)
once that was done, the phone just likes to restart itself every 5 minuets. the only thing it shows is the winpwn pineapple logo, not the apple logo. it shows the logo, sits there for a while and restarts itself. iv'e tried putting it in DFU mode and nothing works. it is not recognized by itunes, and i can only turn it off by holding the power and home buttons. I've also tried a different sim card but this had no effec (i didnt really expect it to)
im not to experienced with this. i had one iphone before but managed to break it shortly after.

Is there some type of physical reset that might work rather than holding the home and power buttons?

[jakecigar]

EXACTLY the same thing just happened to me!
I forced DFU mode (search for it).
and re-installed with a pwned ipsw (made with pwnage)
It's now unlocked and in my niece-in-law's hands.

the key is to force DFU and re-install. it seems erasing via the settings program doesn't work for us.

[cjkawng]

i kinda figured it out by myself...
i didnt know if you held home while it was off, then plugged it into the computer, and kept holding home, it would enter recovery mode.