Yes, I made backup with DDKP3 CF-root.
So my steps should be:
In MIUI v10.2 (say) > download mode > ODIN flash DDKP3
Let it boot.
Download mode > flash kernel -WHICH FILE AND HOW? OR I SHOULD SIMPLY GO IN RECOVERY AND RESTORE NANDROID BACKUP FROM SD CARD?
Sorry, if the above are stupid questions, but I simply don't get 'flash the kernel' because I am not aware of any separate kernel here like UC.
Thanks for your patience and help.
Flash ddkp3, then flash the kernel. Ddkp3 contains stock ddkp3 kernel and not cf root for ddkp3. Thus you need to flash ddkp3 cf root before restoring.
Cheers
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