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Today l upgraded my xperia z5 dual phone and then the wifi doesnt work after upgrade
@bulizen could you please try turning off bluetooth? Will your WIFI work with bluetooth off? Also, did you try restarting your phone in safe mode?
When you say that your WiFi isn't working, what do you mean? Do you see the orange WiFi signal bars or an X over the WiFi icon?
If in safe mode works then you may want to perform a software repair using Xperia Companion.