How to find *.ipsw file on Iphone 3G?

Hello Frens

I have the following questions:
1 I want to jailbreak my iphone 3g 2.2 using quickpwn, however after I selected the 3G option on the front screen, then the tool ask the location of the *.ipsw, then when I browse to my iphone, I cannot find it, How should I do ?

2 Is there any recommendation/guideline which is easy to follow for jailbreaking and unlocking?

3 Once the iphone is unlocked (which I assume in the jailbreak status), if I still want to update the firmware from itunes in the future, what should I do?

Thanks
Santoso

Please do not crosspost in the forum

crossposting??? ohhhh he put one in the 2g and 3g forums!

may I?
ok your answers are HERE but take note that you should post in the right places next time, in your case the iPhone 3G section

Thank you for the advice, regarding the cross post, I apologise, this will not happen again, and will check for the link and let you know the result

cheers

santoso