Why doesn't my wifi work after Windows 10?

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Windows Central Question

why doesn't my wifi work after

i updated my phone to windows 10 preview. And now it shows "try again later or restart your phone" i have done this several time and shows the same responds. i have also done the minor rest still it could not fix it.

what should i do now?

is there any other way to get update to fix this or is it possible to reset to the last OS?