How to upgrade oppo mobile phone version if it is too low?

Brand model: OPPOK9

System: ColorOS 11.1

Taking OPPOK9 as an example, the oppo mobile phone version is too low to upgrade and enter the software update option. Divided into 2 steps, the specific steps are as follows: 1 Enter the settings software update

Open the phone settings and click the software update option.

2 Select Download Now

Enter the page and click Download Now to update.