If I take cwm backup of stock rom is not an pure stock (cwm kernel)for that we need flashtool to get pure stock. am I correct?
Sorry for my bad English
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Half yes. Half no.
If you take cwm backup then you can simply restore it back to get your settings and apps back. Then if you want stock kernel flash kernel only through flash tool. So you have a stock ROM along with your saved settings.
When you want complete stock same as when You first started it then you need to Flash full stock ROM, wipe data and cache and relock bootloader.
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