3uTools
Download Both Versions Using the Links Below
Note: It is recommended that you disable your Anti-Virus Before you Install 3uTools
KDFU
In order to downgrade you need to put your device into KDFU Mode
Cydia Repo: repo.tihmstar.net
iPhone 4s
Download The Following file for your iPhone 4s
iPad 2
Download the File that Corresponds With your iPad 2
Do NOT Use these files on an iPad 2,4