Thanks mastervk ....actually I boot with CWM and according to steps I wiped off my data/factory reset then backed up my ROM
It was written in the steps I was referring .....but anyways its not a big loss...just some 10-15 free applications and some games
I found Jellybeans smoother and the desktop UI now is better...the battery problem is also solved...mine used to shut at 70% but now it worked even till 20%
app loss is not a big deal but if you are regularly playing games then you loose your progress..best way to deal with this situation is to use "titanium backup" free app..you can back up all system data and user data with this app..you can even backup apps so that when you move to new ROM you can install titanium backup and restore all other apps along with data...
you can use apex/nova/holo launcher .these are much better home screen replacements
cool that there is JB custom ROM for funbook..Micromax should provide official JB ROM too...