HMD, I demand a solution to revert back to Oreo (8.1) firmware. Pie firmware or firmwares introduced so many bugs, and none of them are solved or it looks like will be solved. Therefore, I want my phones working more or less flawlessly the way they were on Oreo fw. I really hate my phones now.
If you can't solve Pie bugs, then indulge me in providing a solution to go back to Oreo.