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1. iUnlock PC-software - 16MB
This is a self extracting zip.
2. The latest iPhone firmware file - 246MB.
Make sure you save it as a .ipsw file, and remember where you save it. You should not open it as an archive and extract files from it.
You will also need to have iTunes 8.0 or higher installed. If you do not already have that, you can download iTunes here: http://www.apple.com/itunes/download/ - You can check your version by clicking Help→ About iTunes. Version number is shown on the first line that scrolls upwards.