Hello, I am trying to update an old iphone 3gs that I found in my grandfather's closet. The baseband is 5.11.07 which makes it unlockable. However being that its current software is 3.1.2, I need to upgrade it to 4.2.1 so that I can run redsn0w and unlock the device.

I have been looking all over the internet for the minimal iphone 3gs bundle to upgrade the iphone to 4.2.1 without changing the baseband, every article on the internet including dev-team link here "http://iphwn.org/advanced/iPhone2,1_4.2.1_8C148a.bundle.zip" which no longer exists... does anyone possess a mirror of this file so that I can update?

Thank you