Hi Everyone,
I’ve tried maybe 15 attempts to flash eOS on my oneplus6T following the official doc, this A/B partitioned device tutorial written by @Fluf (thanks to you) and I could not manage to make it work. This was driving me crazy.
In case this tutorial is not working for you, you might be interested by this one : OnePlus 6T – No OS Installed, says TWRP
It is straightforward and it worked at the first attempt. You don’t have to botter with the A or B slots. You simply flash the stock oxygenOS android 9.zip with adb sideload. Your reboot and you do another adb sideload with eOS android 9. The full process is described in post.
Hope it will helps those who are stuck.