Note: The update has some known issues and it will erase all data. So backup your device if you haven't already, before updating. You are not advised to update it on your primary device, and/or if you don't have prior experience with flashing ROMs.
Step 1: First download the ROM upgrade zip file. The links are given below.
Step 2: Place the downloaded ROM file in the phone's internal storage.
Step 3: Enable Developer Mode by going to Settings -> About device -> Version -> Click Build number 7 times and enter the password.
Step 4: Follow these steps: Go to Settings > About device > Up to date > Click the top right button > Local install > Click on the corresponding installation package > Extract > Upgrade > System upgrade completed to 100%.
The device will boot as part of the update process. Once it is done, the lockscreen will appear. This means the update is successful. Open OxygenOS settings and check the software version.
Step 1: First download the ROM upgrade zip file from the specified server.
Step 2: Place the Upgrade package file in the phone storage.
Step 3: Install this APK file on your phone.
Step 4: Press the update. Next, open the app > tap the top right gear icon > find the upgrade package and tap it > wait to finish the installation > tap reboot.
The device will restart as part of the process. Once it is done, the lockscreen appears. Unlock the device and check the software version in OxygenOS settings.