I forgot to mention that THIS PARTICULAR dmesg was indeed taken from 4.5 snapshot, althought I did reinstall to 4.4. Still - it doesn't change anything, because both dmesgs are almost the same and - apparently - 4.4 and 4.5 do not support BCM4315 chipset.
Thank you all for your replies. I will follow your suggestions. And ... I hope it will eventually work. Go devs!
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