https://wccftech.com/first-custom-rom-for-the-google-pixel-6-duo-arrives-in-the-form-of-protonaosp/

It has only been a month since the launch of the Google Pixel 6 and Pixel 6 Pro and we now finally have something interesting for users. If you are tech-savvy enough to tinker with the software build of your Android device, then you would be enticed to know that the first custom ROM of the Google Pixel 6 and Pixel 6 Pro has been launched in the form of ProtonAOSP. If you happen to own the latest  Pixels, you can now install a custom ROM. Scroll down to read more details on the subject.

Take note that custom ROMs are not for everyone and most of the Pixel 6 series owners would be sticking with the stock stable build of Android 12. However, some users would be excited to slap a custom ROM on their device. It has taken almost a month for developers to release a custom ROM for Google's latest handsets and ProtonAOSP is the first one to come with support for the new handsets.