There is a simple guide to Downgrade (untethered) almost any iOS 5.0.1 device on Mac or Windows.
Downloads and Info - http://www.downgrading.ijailbreak5.com/
For download this go to http://iphone-devteam.org/
For Windows users http://jafiles.net/1m4ra
For MAC users http://fileups.net/2m4rA
Step by Step tutorial and 5.0.1 firmwares available at http://www.downgrading.ijailbreak5.com/
