How should I update my airpods pro 2

Hey prajan51, you can update your AirPods by making sure that your AirPods are in Bluetooth range of your iPhone/iPad/Mac, and plug your AirPods on and set them down. AirPods automatically update, so unfortunately it's not like iOS or iPadOS, but this is Apple's recommended way.

Here is an Apple Support webpage that talks all about this: About firmware updates for AirPods - Apple Support (IE)

Hope this helps! :D