Hi folks!
I installed Ubuntu Desktop 16.04. And BT was working out of the box.
But Wi-Fi isn’t working even after copying AP6225(WiFi & BT Firmware) files to /lib/firmware/brcm and rebooting.
Following advices from Here or similar topics, I renamed *‘brcmfmac43455-sdio.ROCK Pi-ROCK Pi X.txt’, but still there is no wifi device.
Any idea? Maybe 16.04 needs another firmware?
##UPD##
Solved this problem. Previously I copied whole directory(BT_WIFI_Firmware) after unzipping. After moving bin and txt files directly under /ilb/firmware/brcm wi-fi works correctly. Don’t repeat my mistakes 
[SOLVED] Ubuntu 16.04 no wifi even after copy WIFI firmware
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