I have ver 1.1.1 iphone (jailbroken + unlocked). It was working properly but after installing some applicaitons the vibrate is not working. I don't know which application caused the issue. I tried to unistall all the applications but still it is not working.
Do I need to restore my OS image or I can try for something else?

If I have restore my OS image then what is the procedure? Do I need to revirinize my iPhone or just resotre the image.

Please check if any of the steps are redunadant.
1. Revirinize the iphone. Do I need to do this?
2. Restore the phone with 1.1.1
3. Jailbreak
4. Unlock.

Thanks in advance