Reputed Developer darkobas (XDA username) has released the brand new OmniRom based on latest Android 8.1 Oreo. It brings latest security updates, wallpapers, launcher and many more value-added features to the OnePlus 5.
With Android 8.1 Oreo, you'll get new Wallpaper Themes, Pixel 2 Launcher, Redesigned Power Menu, new Shutdown and Reboot Animation, Round Statusbar Icons, and Settings.
Note: This procedure is very technical and should be performed by a person with sound knowledge of rooting Android devices. If the step-by-step installation process is not followed properly, there are chances of the smartphone getting bricked or being permanently irreparable. TechDroider cannot be held responsible for any damage or claims from readers if the procedure does not yield the required results or if the smartphone is bricked. Hence, users are advised to proceed with caution.
How to Install Android 8.1 Oreo Omni ROM on OnePlus 5:
Step 2: Boot to TWRP Mode.
Step 3: Once entering the TWRP settings menu, clear phone's memory (full) by selecting 'Wipe' option. Once done, select 'Swipe to Factory Reset' perform factory reset.
Step 4: Return to TWRP settings and tap 'Install' by the selecting .Zip file in the phone's memory.
Step 5: Come back to TWRP menu setting to approve the installation by tapping 'Swipe to Confirm Flash'
Step 6: Flashing of the custom ROM begins and after few minutes, a message 'Successful' appears on the screen, thus completing installation.