Tutorial: Downgrade to 4.3.2 from earlier versions iOS

Have you updated to version 4.3.2 and repent? Here is the solution.
Works for all models of iPhone and iPod Touch.
Just need to save your SHSH on servers Cydia (mandatory).
You have all the information on SHSH on this link .
(Note: You can also download a previous version if you have the SHSH of that version)

We need:
1. Last iTunes available
2. Firmware 4.2.1 for your device (or you want to download)
3. TinyUmbrella

Tutorial:
First of all open TinyUmbrella and bring them again to close, this will modify your hosts file automatically.
1. Tiny Open Umbrella and connect your device.
2. Click the Start button TSS Server (iTunes will close automatically)
3. Open iTunes and click Restore in Windows SHIF + (no need to put in recovery mode enabled device). Alt + Restore on Mac.
4. Select the 4.2.1 firmware we downloaded.
Begin the restoration, do not close TinyUmbrella
If all went well, you can go to Tiny Umbrella and press Stop TSS Server.
Did you come out a 10xx error and has been in recovery mode?
Go to Exit and press TinyUmbrella Recovery
Wait until your device restarts.
Are you still in recovery mode?
Put the iPhone into DFU mode, iTunes will display a warning "detected iPhone in recovery mode
To put the iPhone in DFU, plug the computer and turn it off, press the Home button and the power at the same time for 10 seconds, after 10 seconds left to press the power button, but continue pressing the Home button until it appears in iTunes a message saying it has detected an iPhone in recovery mode.
Once in dfu, go to TinyUmbrella and Recovery and click Fix your device restarts.
"Error 3194?
Uninstall and reinstall iTunes, if this does not fix your error try it on another computer.