When micromax a25 was released
I bought this phone after 1week. Rooted after 3 days and was completely successful. One has to root its phone for playing temple run 1,&2 and other high graphical games like FIFA,PES etc
To root its important you know about simple driver installation guides. If you get even simple doubt ask first and try rooting later.
I dont think new a25 has changes in processor still mtk rooting guides are easily available on net.
CynogenMod cannot be developed officaly for this phone it lacks kernal sources.
Custom ROM can be only possible through android Kitchen.
Modded stock ROM has just pre root and one launcher. (this ROM can be used as stock ROM to recover from any previous fault )
Keep asking specific question in detail D: