تبلیغات Hello Guys
Today I Wanna Post That How To Downgrade :D:D
First You Need To Have These:
1-Itunes (Mine is 10.5 ) :D
2-Ios 4.3.3
3 -Tinyumbrella (5.10.01) :D

If you notice the white Cydia icon (which fails to launch) after successfully jailbreaking your iPod touch. Then follow these steps to fix the issue.
Step 1: Download iOS 4.3.5 and iOS 4.3.4 (required by this version of Redsn0w) firmware file for your device from the links given at the end
Step 2: Download Redsn0w 0.9.8b4 for Windows or Mac. Also make sure you are running the latest version of iTunes, which is version 10.4
Step 3: Now start Redsn0w, browse for the iOS 4.3.4 firmware file (NOT the 4.3.5) that you downloaded in Step 1 and point it towards Redsn0w