I'd love to help on this topic. I also own one of these board.
Mine is a slightly different version, the Banana Pi M2 Berry.
It does not change much. However, I can get Armbian to run on it, but not OpenWrt.
On this page, the links to download the SD card image are broken. Where do I find these files?
Should I compile it myself? But which branch should I use?
Thanks for any help.
Stay safe! Stay home!