There are dozens of MXQ Pro variants (V1.0, V2.2, V5.0, V6.0). Firmware for V3.1 will NOT work on your V3.0. If your board says H3Q44-V3.0 , stick exclusively to that firmware.
Some firmwares for the H3_R69 or sunveill models work but often break Wi-Fi or the remote. firmware tv box mxq pro 4k 5g placa h3q44-v3.0
Check the specific threads for MXQ Pro 4K clones. There are dozens of MXQ Pro variants (V1