So your problem was fixed when you switched to winpwn instead of quickpwn?
I am having similar problem, where I have no reception at all. I had original iphone 2g -> unlocked/jailbroken using ziphone to 1.1.3
I used itunes to restore the firmware to 2.0.1 first (got stuck on the itunes / cable connect screen) and tried quickpwn again and it seemed to go to the home screen.
I can use wi-fi etc (like ipof touch) but no reception. Do you think Winpwn will help?
Is this problem due to unlock or reception issue or something else buggy in quickpwn?