Before downloading any files, you must verify your processor. The MXQ Pro 4K casing is generic. Inside, manufacturers change the internal components constantly. While older models used Amlogic chips (like the S905), newer budget clones heavily utilize the or RK3229 .
Inside system.img :
Optimizes the Android operating system for the RK3228A chip. mxq pro 4k rk3228a firmware repack
Specifically the Rockchip Batch Tool or FactoryTool . Before downloading any files, you must verify your processor