Wireless on Acer Aspire E-15

Having upgraded my broadband connection so that 5G is now supported, how 
do I get Debian 8 to support it?  My 7-year-old MacBook sees it, and 
connects...  Is a firmware upgrade required or something?

I found this with "dmesg":

[    7.168029] ath: phy0: WB335 2-ANT card detected
[    7.168040] ath: phy0: Set BT/WLAN RX diversity capability
[    7.174831] ath: phy0: Enable LNA combining
[    7.175932] ath: EEPROM regdomain: 0x65
[    7.175934] ath: EEPROM indicates we should expect a direct regpair map
[    7.175938] ath: Country alpha2 being used: 00
[    7.175940] ath: Regpair used: 0x65
[    7.410114] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[    7.410812] ieee80211 phy0: Atheros AR9565 Rev:1 mem=0xffffc90004a00000, irq=36

Linux debbie 3.16.0-4-amd64 #1 SMP Debian 3.16.39-1+deb8u2 (2017-03-07) x86_64 GNU/Linux

Thanks.