that method will not get you what you really want. the backup format is one large '.mira ' file and cant get boot.img from that.
you'll need cm2spd to get boot.img [not advisable to buy cause its costly to buy a dongle just to root one phone], instead check around your locale if you can find someone who already has OR you search online for the firmware of your phone build
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Do you guys have firmware for zero diamond cos I'm yet to find anything on Google relating to mine