This will void your warranty, trip Samsung Knox (irreversible), and can brick your device if done incorrectly. Back up your data.
The , specifically model SM-T280 , is a legacy device originally limited to Android 5.1.1 or 8.1. Custom ROMs allow you to bypass these official limits to gain modern app support and improved performance. Available Custom ROMs
A custom ROM is a modified version of the Android operating system that is not officially supported by the device manufacturer. It's a customized version of the Android OS that is designed to provide a unique user experience, fix bugs, and add new features. Custom ROMs are developed by third-party developers and are usually based on the Android Open Source Project (AOSP).