Could not activate iPhone
i run an iphone service shop
a custumer brought an iphone 6 he factory resset it by itself and now iphone got stuck on "could not activate iPhone your iphone could not be activated because the activation server cannot be reached. Try connectin your iphone to iTunes to activate it, or try again in a couple of minutes"
i have tried to : restore it in DFU , in recovery mode , multiple ipsw , multiple ios 11 versions but no luck
after i opened it i saw that iphone was refourbuished but not by apple i think from some chinese company
they had replaced wifi ic and nand chip
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