IPSW is a type of file. IPSW is your software version installed on your iPhone. You can check this by going into settings, general, about.
An IPSW file contains data used by iTunes to restore and update the iPhone and iPod Touch software.
The file extension of iPhone firmware file is .ipsw .
This shuold be what you need: http://www.touchpodium.com/2008/04/07/ipswtool-makes-editing-ipsw-firmware-files-easier/
The IPSW file extension is used by Apple for their firmware updates for the iPhone and iPod.
Put your zip file on your desktop and click rename , then change ZIP to IPSW. tell me if it worket, and please tell me the link where u download that ipsw
This seems to be a problem with network security.Rename, move, or delete the iOS software file (.ipsw) and try again.Restore your device while connected to a different network.Restore using a different computer.The Apple site will help you locate the .ipsw files on your computer.See the link
It is not possible from what I know. I looked into this for an easy hack after I restoredy iPod cuz it froze on cydia. Just use limerain.com for 4.1 hack. Actually, it is possible, by downloading the .ipsw file for 2g-4.1 file for sn0wbreeze. You will need iTunes 10. When you get on the .ipsw file press shift + restore on iTunes with your iPod connected to your computer. This will downgrade your iPod or iPhone to 4.0. Hope this helps!
I am Going To Guess, That IP Stands For iPhone, and SW stands For Software. IPSW = iPhone Software
yes
yes sir
It is better to update both iPhones using the same lines other than downloading another IPSW.