[Q] How to rollback from JB to ICS ?

Hello GT N7000 Users

I've recently upgraded my GT-N7000 to JB, and I need to rollback to the previous ICS

I faced too many issues after upgrading to JB

1- Battery power is drained Very Quickly, almost twice as fast compared to ICS
2- Overall performance is slower
3- Mobile is getting Hotter, and I don't know WHY !!!!!

Please share any previous posts/Links from XDA which can help me

Thanks in Advance