Steps to Install Ultrasn0w on Your iPhone 4/3GS Offline:
NOTE: If you have already installed Ultrasn0w 1.2 on your iPhone, first uninstall it by navigating to Cydia->Manage->Packages->Ultrasn0w->Modify and select Remove option.Step 1: Download Ultrasn0w 1.2.3 DEB file
Download Ultrasn0w 1.2.3 DEB file from Ultrasn0w.com [Direct Link]Step 2: Connect your iPhone to your PC or Mac and launch iPhone Explorer. Place the Ultrasn0w DEB file in AutoInstall directory by navigating to the following location:
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Location: /var/root/Media/Cydia/AutoInstall