Checking the Viper thread it recommends following these steps for updating the firmware, which should fix your wifi problem: http://forum.xda-developers.com/htc-one-m8/development/progress-fuu-m8-t2813792
Download links here: https://docs.google.com/spreadsheets/d/1aNd_nm4Em1wamRLFT7qHM2c3O9_sg_H3ztBrGq1u9Ws/pubhtml
Make sure you flash the latest international file which is 4.16.401.10.
I noticed at the beginning of the thread you flashed a very early version which could be why it bricked your phone (You downgraded it
). And it may still be using those old files....
If that doesn't work, then I suggest flashing the RUU zip I posted earlier to fully return to factory Sense stock, let it OTA update it to the latest version (which will also update the firmware), and then begin flashing a custom ROM after.
Download links here: https://docs.google.com/spreadsheets/d/1aNd_nm4Em1wamRLFT7qHM2c3O9_sg_H3ztBrGq1u9Ws/pubhtml
Make sure you flash the latest international file which is 4.16.401.10.
I noticed at the beginning of the thread you flashed a very early version which could be why it bricked your phone (You downgraded it

If that doesn't work, then I suggest flashing the RUU zip I posted earlier to fully return to factory Sense stock, let it OTA update it to the latest version (which will also update the firmware), and then begin flashing a custom ROM after.
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