I bought the Raspberry Pi 3 around a year ago and maybe 6 months ago I used retropie on it and fiddled with some internet settings. A week later I changed the OS and the integrated wlan0 never worked again, (ethernet works fine)
Did I accidently switch the wifi off somehow? I checked /boot/config.txt and nothing is disabled there, nothing evident in /etc/modprobe.d/raspi-blacklist.conf either.
I'm currently trying to use raspbian, the current release main branch, March 2018. When I do sudo iwlist wlan0 scan it comes up as ''interface doesnt support scanning''. When I do ifconfig-a only eth0 and lo come up too.
What are the most common causes of these problems? I looked around on a slimdevices thread but it didn't help very much. Sorry if this is poorly written, Im trying my best.