Because the Rockchip RK3229 is an older, budget-level chipset (commonly found in TV boxes like the MXQ Pro 4K), there is no single "official" custom ROM. Instead, developers create custom firmware usually based on newer Android versions or optimized stock images.
You will need:
.ko driver file for your specific chip. Inject it via ADB.Over the next three weeks, I tried 11 different “RK3229” ROMs: rockchip rk3229 custom rom