Musclenerd just released ultrasn0w 0.92.1 in the wild. This modified version of ultrasn0w adds support for phones running iOS 4 GM with 04.26.08 baseband (phones upgraded with PwnageTool). Musclenerd fixed the incompatibility issue of ultrasn0w and iOS 4 GM, now this official patched version of ultrasn0w is available on a new Cydia repo, “ http://ios4.ultrasn0w.org ” where ultrasn0w is spelled with a zero, not the letter “o”.
Instructions to install ultrasn0w using cydia
Step One : Press to launch Cydia Installer from your Springboard.
Step Two : Press to select the Manage tab at the bottom of the screen.
Step Three : Press to select the large Sources button
Step Four : Press the Edit button at the top right of the screen.
Step Five : Press the Add button at the top left of the screen.
Step Six : Enter http://ios4.ultrasn0w.org as the source url and press the Add Source button. Note: ultrasn0w is spelled with a zero, not the letter “o”.
Step Seven : Once the source has been added press the large Return to Cydia button.
Step Eight : Press the Done button at the top right of the screen.
Step Nine : Press to select http://repo666.ultrasn0w.com/ from the list of user entered sources.
Step Ten : Press to select ultrasn0w from the list of packages.
Step Eleven : Press the Install button at the top right of the screen.
Step Twelve : Press the Confirm button at the top right of the screen.
Step Thirteen : After installation completes successfully press the large Return to Cydia button.
Step Fourteen : Now press the Home button then power off and power on the iPhone. You do this by holding down the power button for 3 seconds then moving the power slider that appears to the right. Press the power button again to turn on the phone.
Step Fifteen : You should now be able to insert the SIM of your choice!