Need help Upgrading Android 5.1 to Marshmallow (6.0)

Soo i have a ARGOS Bush Spira b2 (google the phone its at argos) and i don't know how to upgrade to android 6 cuz am scared of warnty or rooting etc
I want a safe method to do this bcuz my sister has android 6 when she bought it second hand i got myne Brand New first hand pls help also i would like to create a stock firmware backup of the current phone please help!

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