Iphone strange problem.... DFU Mode
 

Hello i have a iphone 3gs and when i connect a charger or usb cable he goes after 5 minutes in dfu mode...the only solution is update again the firmware in itunes but when i connect him the goes again in dfu mode... i already change the charger and usb cable, Software or i have to change the charge connector?

Did you use blackra1n?

Yes. I don't think this is the problem because i unlock many by blackbrain...