There is updated firmware available in the stable section but I could not find any instructions on which image to use. What is the current state? Is it officially supported? Where can I find more information?
The image files say "bone black" in them. The correct CPU for BB Black is listed on the image files too. Is it a normal practice to also provide unsupported images in the stable download releases?
Your link mentions that "BeagleBoard-xM, BeagleBone, BeagleBone black have similar hw."
So it seems that it supported. It has some information about creating SD card. I think it will be harmless even if it fails as I will not be changing the flash on the device. I will try it later.