How can I restore my device with simply ipsw file and iTunes? I want to restore my iPod touch 4 gen. using a previously downloaded .ipsw file from the web instead of iTunes trying to download it again. I have tried putting the .ipsw file in the ~/Library/iTunes/iPod Software Updates/ folder but it still downloads another one.

By the way, my iPod is stuck in recovery mode and I cannot cannot get it out of it except restoring the iPod. What should I do?
Option-click the Restore button in iTunes and a standard file-selection dialog comes up allowing you to find your .ipsw file.