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This tutorial will show you how to upgrade your iPhone 4 to 4.1 without upgrading its baseband using TinyUmbrella. We recommend reading the TinyUmbrella Read Me Locatedherebefore doing anything. The Mac version of the tutorial is here
Please Note: This ONLY Works with the iPhone 4!
Step One Download TinyUmbrella fromhereAlso make sure to download the iPhone 4 4.1 Firmware LocatedHere
Step Two Right Click the TinyUmbrella 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
Step Three Make sure the device is connected, and Umbrella has detected the type of device and its firmware.
Step Four Hit Start TSS Server and make sure you receive no errors.
Once The TSS Server is "running" successfully, umbrella will kill iTunes. Leave TinyUmbrella Open.
If you do receive an error, DO NOT continue. Your restore will not work if the TSS server cannot be started.
Step Five Open iTunes and Hit Shift+ Restore.
Browse to and select the iPhone 4.1 Firmware File.
Hitokto Restore iPhone
Step Six iTunes should give you error 1004. This is what we wanted, as it notes the baseband has not updated :)
Step Seven Go back to the TinyUmbrella window and ClickKick Device Out of Recovery
Your iPhone will now be on 4.1 with the 1.59.00 baseband! (Which means you can now unlock usingthis tutorial