Unlike smartphones, TV box firmware lives on obscure forums. Do not download from "Free ROM" sites that bundle malware.
Before downloading files, it is critical to understand what Android 11 brings to the RK3328 platform. Officially, Rockchip ended support for the RK3328 at Android 10 (with very few vendor releases). The Android 11 builds available today are primarily custom firmware developed by independent programmers (such as Aidan’s Custom ROM or SLIMBOX). Rk3328 Firmware Android 11
When you download a file named RK3328_Android11_20231012.img, here’s what you’re actually getting: Unlike smartphones, TV box firmware lives on obscure forums