Tutorial to update from 4.0.x to 4.1 WITHOUT updating your baseband!

[ikarus79m]

Notcom (creator of TinyUmbrella) just linked to this tutorial explaining how to upgrade to iPhone 4.1 without upgrading your baseband so that you won't piss away your unlock!

http://tap4.us/k7d (via http://thefirmwareumbrella.blogspot.com/)

Just did it and it worked for me!

 

[soundwarp]

will this work on windows?

 

[savior1974]

That tutorial forgot a very critical step.

After step 3:

You have to save the SHSH files for 4.1 before you can do an upgrade with Tiny Umbrella.

Click on advanced settings, in the device/version box, select iPhone 4 4.1, then click Save my SHSH.

Then proceed to step 4.