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.