Why cant I connect my Lumia 521 to wifi?

[WPCentral Question]

I use a Windows 521, Update 8.1
For some reason, it wont connect to my wifi anymore. It's been perfect for the three years that I've had it, but it just barely started giving me this problem. My PC, which also happens to be 8.1, will connect to the wifi as well as all the other devices. I tried factory resetting my phone, but that still hasn't fixed the answer. I really need some help.

 

[Likwidz]

Have you tried resetting your router or modem?

 

[ibamba]

Download Windows Phone Recovery Tool on Microsoft website and flash the phone then wait about 30 minute and perform a hard reset (Do not put any sim card in the phone after the flash process in completed). This should solved the issue if it is software related.