@Antoxic I just remembered that a board similar to yours was already spotted in the past and a lot of work was done to support it.
It's from @MX10.AC2N and the pictures are at page 15 of this thread.
Nonetheless he has a MXQ_RK3328_D4_A V1.01 board, yours is MXQ_RK3328_D4 V1.3. There can be subtle but important differences.
@MX10.AC2N board houses a rk3328 chip and not a rk3318.
Moreover, if you could extract the dtb from the original android image, or provide the original firmware I can take a look into to understand what are the hardware characteristics of your board.
I guess your board is probably housing an rk3328 because it looks like it has a proper RK805 voltage regulator under the smaller heatsink, which is not common on rk3318 boards.