Issues with Jailbreaking 3G 2.1

[InfinitSilver]

Hello guys! I will greatly appreciate if somebody could help me with this. It's been a week that I am struggling and cannot do anything.

I am trying to jailbreak Iphone 3G 2.1 Firmware with QuickPwn. Followed all instructions, downloaded all files. Opened QuickPwn, chose my iphone type and in the next window where it wants to Browse for Firmware software, I click Browse to point to the folder where I downloaded and saved it, but it does not recognize the file. I open the folder and it shows that it's empty... So I cannot proceed to jailbreak it b/c it's stuck there and do not detect my firmware downloaded file...

Any ideas! Thanks a million!