Yesterday, ColorOS officially announced that OnePlus 9RT 5G open ColorOS 12 x Android 12 official version upgrade (official version number is C.04 and above).
Oneplus 9RT 5G users will need to ensure that the phone version has been upgraded to base version A.14 or higher. This upgrade will not clear user data. However, you are advised to back up important personal data before the upgrade.
To view the version number, go to Settings > About Mobile Phone > Version Info > Version Number
How to apply: Settings > About PC > Version Information > Settings icon in the upper right corner > Early Application > Official Application
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ColorOS officials said that within two days after the upgrade, a series of adaptation and optimization actions will be carried out in the background of the system, which may cause the phone to heat up, lag and consume power quickly. After the upgrade, you are advised to turn off the screen and restart the phone 2 hours after charging, or the phone will recover after normal use for a period of time.