As we all know, OnePlus 9 series phones switch to ColorOS from HydrogenOS in China, so how to switch install Oneplus 9 Pro from ColorOS to OxygenOS, Gizmoweek post a how to guide without unlocking the bootloader, support official OTA update.
Please keep battery life of OnePlus 9 Pro phones above 60% before starting install the phones, backup personal data.
1, Download downgrade zip file, OnePlus 9 Pro download link https://dubox.com/s/10afc-KlIha3-XYba92Uasw (Password e222 ) , OnePlus 9 download link: https://dubox.com/s/1nFEumPjIAy72JNRmM5lolg (Password qywr).
2, Download complete and copy to phones, tap the OnePlus 9 Pro : “Settings” > “Software update” > “Settings (top right corner Gear icon)” > “Select installation package” > Select the intell ROM file > tap “Install now”
3, Please waiting loading and reading file package to 100%, tap restart and update the phone automatic from ColorOS to OxygenOS.
EDIT’S PICK : How to buy OnePlus Phones in Australia