I have opo device with Oreo, I did found only one solution:
1- add my network manually (hidden SSID also ip config if DHCP disabled)
2- install "WiFi Manager" app
3- open "WiFi Manager" app and tap on saved network and it will be connect.
another annoying issue is: the volume panel has very shortly disappear timeout , I suggest 5 seconds for it.
f*u**k this phone...
I've MIFARE card ISO/IEC 14443, lg pro & sony Z1 & samsung galexy and... phones can read it, but the OPO doesn't.
I love this approach, first step to safe our privacy is: Start from ourself.
microG let us to buy device x$ but don't have to sale our information to Google 0$ ! my opo device without google app is faster and cooler!
I hope the microG project can ...
better world with better privacy control.
thank you developer(s)