Please note that the MXQ Pro 4K sold on many online store still advertise containing amlogic s905x but the soc now is an Rockchip rk3229, actually unsupported.
I bought one of those and sent it back, but last week a friend bought the same from a different store and had the same issue.
Note that both stores didn't corrected the title of the article so even if same days has passed they're still advertised the mxq as containing an S905x.