Warning : Do not attempt to downgrade your smartphone in case you are on Android Q / LOS 17.0 or Android Pie / LOS 16.x.
Downgrading a device from Q or Pie to Oreo or Nougat operating system can cause your device to brick and become unusable.
If you are on these OS versions Please stop at this point and continue using your current Operating System.
In my experience, these warningson the website /e/ documentation Install /e/ on a OnePlus 6 - “enchilada” are no longer relevant since /e/ OS 9-pie e-0.7-p- / e-0.8-p-2020*.
Changing the operating system from stockROM Oxygen OS 10 to /e/ OS 9-pie usually causes little to no problems. But if you want to be on the safe side, do a stockROM downgrade from Oxygen OS 10 to Oxygen OS 9 and then install the e/ ROM latest “enchilada” dev build.
Connect your usb cable on computer, Shut the phone, press volume + 5seconds, keep volume + and plug USB c , then release volume button. Then start the application MSM.
Also, I’m very happy with /e/ on oneplus 6 but there is 2 “difficulties” :
1.There is no OTA : you have to upgrade manually by doing the update like you would on OTA first and “finish” the job with fastboot in recovery (not twrp).
There is no swipe gesture to use “back” and “home” fonctions. I found an app (after long research) that does it very well : Fluid N.G or Fluid Navigation Gesture. You’ll have to be rooted or if not, you’ll have to use adb with a command prompt on your computer.