I found and followed instructions on a help page (How to enable HTTPS) to enable HTTPS. Now the router is thought to be a hacker by Chrome and refuses all outside communication. My router AC3200 is not included in a list entitled "Firmware currently supports". It then gives two methods: install certificate and Let's Encrypt. I used install certificate.
I think the cryptic "Firmware currently supports" means that I cannot get HTTPS for my router and I need to reset to factory settings. Can someone confirm this for me?
