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.
I am Going To Guess, That IP Stands For iPhone, and SW stands For Software. IPSW = iPhone Software
Iphone Software
yes
This shuold be what you need: http://www.touchpodium.com/2008/04/07/ipswtool-makes-editing-ipsw-firmware-files-easier/
It is better to update both iPhones using the same lines other than downloading another IPSW.
nope, u get the ipsw from apple, the legal distributor
The file extension of iPhone firmware file is .ipsw .
The IPSW file extension is used by Apple for their firmware updates for the iPhone and iPod.
An Ipsw is the firmware bundle downloaded for your iphone eg. 2.2 3.0 you can download firmware bundles from the internet or if you updated the iphone using itunes (windows) then go to \Documents and Settings\[username]\Application Data\Apple Computer\iTunes\iPhone Software Updates
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