https://wccftech.com/download-apple-releases-ios-15-3-and-ipados-15-3-beta-2/

Apple has just released beta 2 of iOS 15.3 and iPadOS 15.3 for iPhone and iPad. This update is meant for developers only.

The first beta of iOS 15.3 and iPadOS 15.3 released just over three weeks ago and Apple had to close shop for the holidays, hence no other beta was released. Now though, things are back in motion and Apple has released the second beta of iOS 15.3 and iPadOS 15.3. If you are a registered developer, you can go right ahead and download the update instantly.