https://www.macrumors.com/how-to/install-airpods-pro-beta-firmware/
Install the AirPods Pro Firmware Profile on iPhone
- On your iPhone, go to the Apple Developer website, log in, and navigate to the downloads section.
- Tap on the carrot in the upper right corner and then tap on “More.”
- Scroll down to “AirPods Pro beta” and tap on “View Details.”
- Tap on the iOSAirPodsProSeed.mobileconfig configuration profile.
- Tap on “Allow” to install it, and select the iPhone.