iPhone 4 home button broken + jailbreak

[Pullamosso]

My phone has a broken home button and because of that there is no way to open this device because it is jailbroken. Is there a way to totally reset my phone through usb without entering DFU? Also it would help if i could just fix the button. I also installed a new metal middle plate and I thought the problem was the little metal circle behind the home button and I put it in the new plate and nothing. So if anyone has suggestions on how to repair the button or how to reset my phone, I would appreciate some help.

P.S: sorry, if my english is bad.