@Atamido I tried the new version on the R8000P and found some kmods that look like they would support the broadcom wifi hardware.
Unfortunately, they don't (or at least, I found no way to get it working). Seems like, the BCM4365E chipset seems to be still unsupported. lspci shows nothing and so, the router is still capable only handling wired connections.
That's really a pity as this device is powerful enough to handle even 1Gbit connections and quite cheap to get. But without wireless support, it is pretty useless for me.