[Q] Karbonn a11. lewa os to stock rom

Hi, this.question might be silly, but still.....
I am planning to flash Lewa Os on my rooted Karbonn a11. I have taken a Nandroid backup.
If, at some point i want to return to my stock os, Can i just restore the backup, or do i need to use flashtool, and connect my phone without the battery etc etc..
PLEASE HELP

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