Nexus 6p wifi,mobile data not working(drivers missing)

Please can anyone tell me
how do i get over this prblm
wifi in my phone is not working

someone suggested me to root the phone bt it was useless
then i unrooted the phone
but wifi and mobile data is not working yet

so please can anyone help me
what to do

maybe if i install the wifi drivers in the phone it will work
but where do i get it?

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