Qualcomm Atheros QCA61x4A / QCA6174 wireless driver Ubuntu 16.04

Please, explain for noob. I am not a developer. I tried several things before, so now:

um@um-Aspire-R5-471T:~$ git clone https://github.com/jeremyb31/ath10k-firmware.git
fatal: destination path 'ath10k-firmware' already exists and is not an empty directory.

um@um-Aspire-R5-471T:~$ sudo cp ath10k-firmware/ /lib/firmware/ath10k/
cp: omitting directory 'ath10k-firmware/'

I am not sure how to use your link?

I assume the wifi doesn't work, because clicking on the network icon the entry "Wi-Fi Networks" is greyed out.