[Q] superSU not working in my xolo q800

my frnd rooted my xolo q800
now i want to update to the official android 4.2 version, as i never done rooting and was not know the steps for unrooting ,
there is a mistake is done by me during unrooting of my xoloq800.
i was opened SuperSU and go to its setting ,there was a option of unroot ,i click on that one and confirm rooting, i restart my phone and my phone was not unrooted.,
Now when i open the SuperSu app ,it shows "there is no SU binary installed, andSuperSu cannot install it. This is a Problem."
framaroot is not working it shows:- your device seems not vulnerable to exploit included in framaroot.
root checker shows:- sorry! this device does not have root accesss!
plzzzzz help me.
guide me step by steps for unrooting, softwares required ,plzzzz

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