Install Android 10 on Meizu Note 9 (AOSP GSI Treble ROM) - How to Guide! By Smartphone Upgrade Guide

Install Android 10 on Memo note 9 via AOSP GSI tribal roam. Please check the description for important notes in all the download links. First download, ROM and g apps packages, then transfer the downloaded files to the phone storage link is in the description below step.2 boots, your device into T WRAP recovery once in T, WRAP click on wipe, advanced wipe and select the checkboxes, as shown in the image, excluding internal storage step, 4 swipes the button to wipe the device step.5 go back to the recovery main screen and tap on the installation button step, 6, navigate to the storage and select the GSI ROM file, step 7. Finally, swipe the button on the screen to install ROM file, step 9 after g apps flashing completes, select, wipe cache and Davis from bottom left side of screen and swipe to white step 10. When the flashing process is complete, hit reboot system, that's it. You have successfully installed the ROM on your device.

Source : Smartphone Upgrade Guide