I've just made an installer source to download BootNeuter.app for everyone who can't use pwnage tool! Simply install this app and select it from the homescreen and use it too up/downgrade the bootloader etc..
Add this source: http://scape-server.org/iphone
It is under the tools section.
Bootneuter is a very dangerous app and you guys should be careful when downloading it from a different source than the Dev Team.
Make sure the source you get such app from is verified or sure before installing it
Remember the first malware released using Installer.app
You don't want to transform your phone into a permanent brick.
The above mentioned, this source has been confirmed as trustworthy. I will leave the message from XianLi in the post though.
Multiple people have used this source to download the app in this thread. If you read them then you will see that it is genuine