The Rockchip RK3128 is a cost-effective quad-core ARM Cortex-A7 processor widely used in entry-level Android TV boxes, car head units, and IoT devices. Because it is an older platform (circa 2014-2015), firmware management requires specific legacy tools.
You’ll find this chipset in a variety of hardware. If you own one of these, firmware options are likely available: rockchip rk3128 firmware
The Firefly-RK3128 and various System-on-Modules (SoM) used in industrial controllers. The Rockchip RK3128 is a cost-effective quad-core ARM