How do I downgrade my iP4 from 4.1 to 4.0.1?

[helloimD4NNY]

Sorry if this question is asked a lot. I searched the forums but didn't really find my answer.

Cydia says that "This device has SHSHs on file for iPhone OS / iOS : 4.0.1, 4.0.2" so I assume it's SHSH'd. What I want to know is if I upgrade to 4.1 and want to go back to 4.0.1, how exactly would I go about doing that?

 

[Myzhi]

Repost X per day.

Download and run Tinyumbrella:
1) Make sure you Iphone is detected.
2) check "Advanced Options."
3) In new window, under "Device / Version," select the firmware version you want to downgrade to.
4) Click on "Save my SHSH." Pray Cydia has them. If you don't get an error, it has been saved onto your computer.
5) Repeat to save other firmware hashes if you wish.
6) Now, click on "Display SHSHs." It should listed all hashes you have saved on your computer and the firmware you can downgrade to.
7) Start "TSS server," download firmware file somewhere (google) and restore through iTunes with that file.
8) If you phone get stuck during restore, trying "Kick out of recovery..."'in Tinyumbrella.