In page station m2 -armbian say:
Important. For the new images to work, it is necessary to update the u-boot in eMMC on M2\P2. The new version of u-boot is compatible with the existing official versions of Station and Ubuntu, which are released by Firefly. To upgrade to the new version of u-boot, you need to follow several steps.
1. Download a special version of the image from the link.
download link
but the download link:
Nothing found
There's a typo in the link, or the owner deleted the files or restricted access to them.
Please update the download link,thanks!