It looks like you're looking for Android 3.0 "Honeycomb" ROMs — specifically for a device you might be calling "Android 30" (a common typo for 3.0).
. It introduced the iconic "Holographic" UI and software-based navigation buttons that eventually became standard across all Android devices Top Sources for Android 3.0 Honeycomb ROMs android 30 honeycomb rom download top
Headline: Flashback: How to Download and Install Android 3.0 Honeycomb ROMs on Legacy Tablets It looks like you're looking for Android 3
Virtual Navigation Buttons: It removed the need for physical hardware buttons (Home, Back, Menu), moving them into the software "System Bar" at the bottom. Download the ZIP file from the archive link below
Android 3.0 "Honeycomb" is a unique chapter in mobile history as the only version of Android designed exclusively for tablets. Released in 2011 to compete with the iPad, it introduced the "Holographic" UI that transitioned Android from its signature green to a futuristic blue aesthetic.
Because Honeycomb was never fully open-sourced in its original form, finding "top" ROMs often means looking at specific device ports or archived projects.