How to Downgrade Your IDevice

For those of you who don't know how to jailbreak here is a guide how to. Downgrading is the process of which lets just say you upgraded your ipod to 4.1 and wanted to downgrade to 4.0 to jailbreak.
First of all you need to have your shsh blobs saved by cydia you either did this when you clicked make my life easier or saved your blobs with tinyumbrella. Here are the steps to downgrade:
Step 1: Go to http://www.felixbruns.de/iPod/firmware/ and download the firmware for your Device.
Step 2: You need to redirect itunes to saurik's  (cydia's) server by left clicking on wordpad and run as admin.On the top left click file then open. In the top bar type this in C:\windows (Then press return).Now click in to the System32 folder ,then click in to the etc folder.Now on the bottom right click on the drop down bar and click on all documents.Click on the hosts file at the top and copy and paste this 74.208.105.171 gs.apple.com.
Step 3: Set your iDevice in to DFU mode:
#1 connect your device to pc
#2 Open up iTunes
#3 Hold down power & home button at the same time for 10 seconds then let go of the power button and keep hold of the home button for a further 5 seconds iTunes should now pop up with a restore message
#4 Now shift click on the restore button this will allow you to search for the firmware you saved to the desktop.

If you get an error use tinyumbrella to kick your device out of recovery mode.
Tinyumbrella download: http://thefirmwareumbrella.blogspot.com/ some information taken from d7's downgrade video http://www.youtube.com/watch?v=4H0-Fk-d3gM check it out, download your firmware at http://www.felixbruns.de/iPod/firmware/ and don't forget to follow me on twitter twitter.com/nkapoor124 thanks :)