Asus T100HA Wi-Fi

[5unbeam]

Hello!
I've installed Debian 10.4 Gnome nonfree on my laptop.
Hardware supports 5MHz wifi, but I can connect only to 2.4MHz.
How do I turn on 5MHz?
I did everything mentioned in wiki https://wiki.debian.org/InstallingDebianOn/Asus/T100HA
It works fine in Mint. More stability is also an advantage for me. Is it possible to use the same solution as it is in Mint?
hwinfo:

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  P: /devices/pci0000:00/80860F14:01/mmc_host/mmc1/mmc1:0001/mmc1:0001:1/net/wlan0
  L: 0
  E: DEVPATH=/devices/pci0000:00/80860F14:01/mmc_host/mmc1/mmc1:0001/mmc1:0001:1/net/wlan0
  E: SUBSYSTEM=net
  E: DEVTYPE=wlan
  E: INTERFACE=wlan0
  E: IFINDEX=2
  E: USEC_INITIALIZED=10326789
  E: ID_NET_NAMING_SCHEME=v240
  E: ID_NET_NAME_MAC=wlxe076d04d5e06
  E: ID_OUI_FROM_DATABASE=AMPAK Technology, Inc.
  E: ID_MM_CANDIDATE=1
  E: ID_PATH=platform-80860F14:01
  E: ID_PATH_TAG=platform-80860F14_01
  E: ID_NET_DRIVER=brcmfmac
  E: ID_NET_LINK_FILE=/usr/lib/systemd/network/99-default.link
  E: SYSTEMD_ALIAS=/sys/subsystem/net/devices/wlan0
  E: TAGS=:systemd:

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  SysFS ID: /devices/pci0000:00/80860F14:01/mmc_host/mmc1/mmc1:0001/mmc1:0001:1
  SysFS BusID: mmc1:0001:1
  Hardware Class: network
  Model: "Broadcom BCM43341 WLAN card"
  Vendor: sdio 0x02d0 "Broadcom Corp."
  Device: sdio 0xa94d "BCM43341 WLAN card"
  Driver: "brcmfmac"
  Driver Modules: "brcmfmac", "brcmfmac", "brcmfmac"
  Device File: wlan0
  Features: WLAN

[Head_on_a_Stick]

I did everything mentioned in wiki https://wiki.debian.org/InstallingDebianOn/Asus/T100HA

That's an old guide that recommends installing an outdated, unsupported, vulnerable kernel version and also provides a non-working command string to copy the wireless firmware description file from the motherboard NVRAM to your system. The OpenELEC download isn't needed any more either because Debian now have a package for that firmware.

Ensure that your running kernel is the latest Debian stable version and run

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# apt install firmware-brcm80211
# mount -t efivarfs efivarfs /sys/firmware/efi/efivars
# cp /sys/firmware/efi/efivars/nvram-74b00bd9-805a-4d61-b51f-43268123d113 /lib/firmware/brcm/brcmfmac43340-sdio.txt

If that doesn't get 5MHz working then check dmesg(8) in Mint to see what's happening there, compare that output with your Debian system.