How to force armbian create an AP with 2.4 GHz instead of 5 GHz?

Question

Orange Pi 3. Armbian-config creates a hotspot for Wi-Fi 5 GHz on channel 40 and sometimes on 2.4 GHz. I know it scanning for better, but I need to always create 2.4 GHz Wi-FI AP. If I'm just changing channel from 40 to 6 AP doesn't work at all.

Answer 1

Edit the file /etc/hostapd.conf and locate the #IEEE 802.11 section. Then, comment all of the uncommented lines. For example:

### IEEE 802.11n
## ieee80211n=1
## ht_capab=[DSSS_CK-40][HT20+]
## country_code=US
## ieee80211d=1
## IEEE 802.11n
IEEE 802.11a
hw_mode=a
IEEE 802.11a
IEEE 802.11ac
ieee80211ac=1
vht_capab=
vht_oper_chwidth=1
vht_oper_centr_freq_seg0_idx=42
IEEE 802.11ac

Answer 2

I set channel to 3 (another 2.4G channel also will work). Then I commented hw_mode=a and ieee80211ac=1.

As the attached figure suggests.