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download link: http://fastfilehub.com/RonnieFink76/itunes
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[Remember if you require an unlock do not upgrade to iOS 4.1, you will need to wait for the next PwnageTool release. The only exception is the iPhone 4 which could be upgraded to iOS 4.1 without updating the baseband]
Download TinyUmbrella from here Also make sure to download the iPhone 4 4.1 Firmware
Right Click the TinyUmbrella exe (umbrella-4.1.6.exe) and Choose Run as administrator from the contextual popup menu.If you get a Windows Security Alert, make sure both boxes are checked, and hit Allow Access.
Make sure the device is connected, and Umbrella has detected the type of device and its firmware.
Make sure Cydia or TinyUmbrella has an SHSH of the latest firmware. You can do this by simply clicking Save my SHSH
Hit Start TSS Server and make sure you receive no errors.
If you do receive an error, DO NOT continue. Your restore will not work if the TSS server cannot be started.
Open iTunes and Hit Shift+ Restore [DO NOT HIT on Update]
Browse to and select the iPhone 4.1 Firmware File.
Hit ok to Restore iPhone.
iTunes should give you error 1004.
This is what we wanted, as it notes the baseband has not updated :)
Go back to the TinyUmbrella window and Click Kick Device Out of Recovery
If you have issues here, try closing and re-opening TinyUmbrella. [If Tiny Umbrella Doesn't respond, Then Just Close tinyUmbrella, Open it again and then Hit device out of Recovery.
Now you will se Limera1n icon on your iPhone homescreen.
Select Cydia and Hit on Install [WiFi required]
Open Limera1n again hit on the little Red Line that will give you the option to delete Limera1n.
Now that you have your Baseband preserved to 01.59.00 for iPhone 4 Open Cydia Goto Search Tab, and type Ultrasn0w.
Install Ultrasn0w [Used to Unlock] and Violla!!!