Qualcomm Atheros AR9287 Wireless Network Adapter does not turn on

I just installed a single Manjaro/Cinnamon to a brand new SSD on my Acer Aspire 4755G laptop. I am unable to turn on the wireless adapter: if I try it, immediately it turns off.
Previously I removed my HDD with a Windows 10 Home. The wireless adapter worked fine.

Some info:
[...]$ rfkill
0 wlan acer-wireless unblocked unblocked
1 bluetooth acer-bluetooth unblocked unblocked
2 wlan phy0 unblocked blocked

[...]$ inxi -F
Device-1: Qualcomm Atheros AR9287 Wireless Network Adapter driver: ath9k
IF: wlp3s0 state: down mac: ...

What should I do to fix this?

See this

Thanks for the answer.
Finally I could solve my wifi problem. It was as simple as I have to turn on the appropriate switch in order to make light...
'Hard blocked' means here namely that the RF switch is off. Unfortunately it took me hours to realize this after surfing the web looking for a software or a configuration solution... But this is a 'hard switch'. Such I just had to press Fn/F3 on my Acer laptop...

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