Here’s a step-by-step tutorial on how to install the latest Android Pie Beta 2 ROM for your Samsung Galaxy S9 or S9+ Exynos models along with Samsung One UI. For rooted users, you will be able to enjoy the latest Samsung One UI along with ton of customization such as mapping your Bixby to Google Assistant, enable call recording, and lots more.
Step 1. You will need a rooted Galaxy S9/S9+ with TWRP recovery installed. If you have not rooted your Galaxy S9/S9+, please follow How to Root Galaxy S9/S9+ first.
Step 3. Reboot into TWRP recovery.
Step 4. Do a factory reset for new install.
Step 5. Install ROM.
Step 6. Install BL/Modem zip file.
Step 7. Reboot & Profit!