i'm trying to configure WiFi on my Mini PC Beelink BT3 PRO that has a Broadcom AP6255.
I tried many of the proposed solutions online but with no success. The interface just does not show up.
This is the result of wireless-info.

########## wireless info START ##########



Report from: 22 Aug 2019 14:20 CEST +0200



Booted last: 22 Aug 2019 00:00 CEST +0200



Script from: 22 Oct 2018 03:34 UTC +0000



##### release ###########################



Distributor ID: Ubuntu

Description:    Ubuntu 18.04.3 LTS

Release:    18.04

Codename:   bionic



##### kernel ############################



Linux 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux



Parameters: ro



##### desktop ###########################



sed: can't read /home/kofm/.dmrc: No such file or directory



Could not be determined.



##### lspci #############################



01:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 0c)

    Subsystem: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:0123]

    Kernel driver in use: r8169



##### lsusb #############################



Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

Bus 001 Device 002: ID 0c45:7603 Microdia 

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub



##### PCMCIA card info ##################



'pccardctl' is not installed (package "pcmciautils").



##### rfkill ############################



./wireless-info: line 192: rfkill: command not found



##### secure boot #######################



SecureBoot disabled



##### lsmod #############################



brcmsmac              565248  0

cordic                 16384  1 brcmsmac

bcma                   57344  1 brcmsmac

mac80211              782336  1 brcmsmac

snd_soc_sst_bytcr_rt5651    20480  0

brcmfmac              315392  0

brcmutil               16384  2 brcmfmac,brcmsmac

cfg80211              622592  3 brcmfmac,mac80211,brcmsmac

snd_soc_rt5651         90112  2 snd_soc_sst_bytcr_rt5651

snd_soc_acpi           16384  2 snd_soc_sst_bytcr_rt5651,snd_intel_sst_acpi

snd_soc_rl6231         16384  1 snd_soc_rt5651

snd_soc_core          241664  3 snd_soc_rt5651,snd_soc_sst_bytcr_rt5651,snd_soc_sst_atom_hifi2_platform

snd_pcm                98304  6 snd_soc_rt5651,snd_soc_sst_bytcr_rt5651,snd_hdmi_lpe_audio,snd_soc_sst_atom_hifi2_platform,snd_soc_core,snd_pcm_dmaengine



##### interfaces ########################



##### ifconfig ##########################



1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000

    link/loopback <MAC address> brd <MAC address>

    inet 127.0.0.1/8 scope host lo

       valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host 

       valid_lft forever preferred_lft forever

2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000

    link/ether <MAC 'enp1s0' [IF1]> brd <MAC address>

    inet 192.168.1.135/24 brd 192.168.1.255 scope global enp1s0

       valid_lft forever preferred_lft forever

    inet6 fe80::<IP6 'enp1s0' [IF1]>/64 scope link 

       valid_lft forever preferred_lft forever



##### iwconfig ##########################



lo        no wireless extensions.



enp1s0    no wireless extensions.



##### route #############################



default via 192.168.1.1 dev enp1s0 proto static 

192.168.1.0/24 dev enp1s0 proto kernel scope link src 192.168.1.135 



##### resolv.conf #######################



[777 root '/etc/resolv.conf' -> '../run/systemd/resolve/stub-resolv.conf']



nameserver 127.0.0.53

options edns0



##### network managers ##################



Installed:



    None found.



Running:



    None found.



##### NetworkManager info ###############



NetworkManager is not installed (package "network-manager").



##### NetworkManager.state ##############



cat: /var/lib/NetworkManager/NetworkManager.state: No such file or directory



##### NetworkManager config #############



[[/usr/lib/NetworkManager/conf.d/no-mac-addr-change.conf]]

[device-mac-addr-change-wifi]

match-device=driver:rtl8723bs,driver:rtl8189es,driver:r8188eu,driver:8188eu,driver:eagle_sdio,driver:wl

wifi.scan-rand-mac-address=no

wifi.cloned-mac-address=preserve

ethernet.cloned-mac-address=preserve



##### NetworkManager profiles ###########



No NetworkManager profiles found.



##### Netplan config ####################



[/etc/netplan/01-netcfg.yaml]

network:

  version: 2

  renderer: networkd

  ethernets:

    enp1s0:

      addresses: [ 192.168.1.135/24 ]

      gateway4: 192.168.1.1

      nameservers:

          addresses: [8.8.8.8,4.4.4.4]



##### iw reg get ########################



Region: Europe/Rome (based on set time zone)



global

country 00: DFS-UNSET

    (2402 - 2472 @ 40), (N/A, 20), (N/A)

    (2457 - 2482 @ 20), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN

    (2474 - 2494 @ 20), (N/A, 20), (N/A), NO-OFDM, PASSIVE-SCAN

    (5170 - 5250 @ 80), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN

    (5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS, AUTO-BW, PASSIVE-SCAN

    (5490 - 5730 @ 160), (N/A, 20), (0 ms), DFS, PASSIVE-SCAN

    (5735 - 5835 @ 80), (N/A, 20), (N/A), PASSIVE-SCAN

    (57240 - 63720 @ 2160), (N/A, 0), (N/A)



##### iwlist channels ###################



lo        no frequency information.



enp1s0    no frequency information.



##### iwlist scan #######################



lo        Interface doesn't support scanning.



enp1s0    Interface doesn't support scanning.



##### module infos ######################



[brcmsmac]

filename:       /lib/modules/4.15.0-58-generic/kernel/drivers/net/wireless/broadcom/brcm80211/brcmsmac/brcmsmac.ko

firmware:       brcm/bcm43xx_hdr-0.fw

firmware:       brcm/bcm43xx-0.fw

license:        Dual BSD/GPL

description:    Broadcom 802.11n wireless LAN driver.

author:         Broadcom Corporation

srcversion:     823188596714968C60828FF

depends:        mac80211,bcma,brcmutil,cfg80211,cordic

retpoline:      Y

intree:         Y

name:           brcmsmac

vermagic:       4.15.0-58-generic SMP mod_unload 

signat:         PKCS#7

signer:         

sig_key:        

sig_hashalgo:   md4



[bcma]

filename:       /lib/modules/4.15.0-58-generic/kernel/drivers/bcma/bcma.ko

license:        GPL

description:    Broadcom's specific AMBA driver

srcversion:     F4DB57748318105D28C557A

depends:        

retpoline:      Y

intree:         Y

name:           bcma

vermagic:       4.15.0-58-generic SMP mod_unload 

signat:         PKCS#7

signer:         

sig_key:        

sig_hashalgo:   md4



[mac80211]

filename:       /lib/modules/4.15.0-58-generic/kernel/net/mac80211/mac80211.ko

license:        GPL

description:    IEEE 802.11 subsystem

srcversion:     FDB9FBFE52A6192B8CC9B9E

depends:        cfg80211

retpoline:      Y

intree:         Y

name:           mac80211

vermagic:       4.15.0-58-generic SMP mod_unload 

signat:         PKCS#7

signer:         

sig_key:        

sig_hashalgo:   md4

parm:           minstrel_vht_only:Use only VHT rates when VHT is supported by sta. (bool)

parm:           max_nullfunc_tries:Maximum nullfunc tx tries before disconnecting (reason 4). (int)

parm:           max_probe_tries:Maximum probe tries before disconnecting (reason 4). (int)

parm:           beacon_loss_count:Number of beacon intervals before we decide beacon was lost. (int)

parm:           probe_wait_ms:Maximum time(ms) to wait for probe response before disconnecting (reason 4). (int)

parm:           ieee80211_default_rc_algo:Default rate control algorithm for mac80211 to use (charp)



[brcmfmac]

filename:       /lib/modules/4.15.0-58-generic/kernel/drivers/net/wireless/broadcom/brcm80211/brcmfmac/brcmfmac.ko

license:        Dual BSD/GPL

description:    Broadcom 802.11 wireless LAN fullmac driver.

author:         Broadcom Corporation

firmware:       brcm/brcmfmac4373-sdio.bin

firmware:       brcm/brcmfmac4356-sdio.bin

firmware:       brcm/brcmfmac4354-sdio.bin

firmware:       brcm/brcmfmac43455-sdio.bin

firmware:       brcm/brcmfmac43430-sdio.bin

firmware:       brcm/brcmfmac43430a0-sdio.bin

firmware:       brcm/brcmfmac4339-sdio.bin

firmware:       brcm/brcmfmac43362-sdio.bin

firmware:       brcm/brcmfmac4335-sdio.bin

firmware:       brcm/brcmfmac43340-sdio.bin

firmware:       brcm/brcmfmac4334-sdio.bin

firmware:       brcm/brcmfmac4330-sdio.bin

firmware:       brcm/brcmfmac4329-sdio.bin

firmware:       brcm/brcmfmac43241b5-sdio.bin

firmware:       brcm/brcmfmac43241b4-sdio.bin

firmware:       brcm/brcmfmac43241b0-sdio.bin

firmware:       brcm/brcmfmac43143-sdio.bin

firmware:       brcm/brcmfmac4373.bin

firmware:       brcm/brcmfmac43569.bin

firmware:       brcm/brcmfmac43242a.bin

firmware:       brcm/brcmfmac43236b.bin

firmware:       brcm/brcmfmac43143.bin

firmware:       brcm/brcmfmac4371-pcie.bin

firmware:       brcm/brcmfmac4366c-pcie.bin

firmware:       brcm/brcmfmac4366b-pcie.bin

firmware:       brcm/brcmfmac4365c-pcie.bin

firmware:       brcm/brcmfmac4365b-pcie.bin

firmware:       brcm/brcmfmac4359-pcie.bin

firmware:       brcm/brcmfmac4358-pcie.bin

firmware:       brcm/brcmfmac43570-pcie.bin

firmware:       brcm/brcmfmac4356-pcie.bin

firmware:       brcm/brcmfmac4350c2-pcie.bin

firmware:       brcm/brcmfmac4350-pcie.bin

firmware:       brcm/brcmfmac43602-pcie.bin

srcversion:     DDCAB95D12632C778BDAC0E

depends:        brcmutil,cfg80211

retpoline:      Y

intree:         Y

name:           brcmfmac

vermagic:       4.15.0-58-generic SMP mod_unload 

signat:         PKCS#7

signer:         

sig_key:        

sig_hashalgo:   md4

parm:           txglomsz:Maximum tx packet chain size [SDIO] (int)

parm:           debug:Level of debug output (int)

parm:           p2pon:Enable legacy p2p management functionality (int)

parm:           feature_disable:Disable features (int)

parm:           alternative_fw_path:Alternative firmware path (string)

parm:           fcmode:Mode of firmware signalled flow control (int)

parm:           roamoff:Do not use internal roaming engine (int)



[brcmutil]

filename:       /lib/modules/4.15.0-58-generic/kernel/drivers/net/wireless/broadcom/brcm80211/brcmutil/brcmutil.ko

license:        Dual BSD/GPL

description:    Broadcom 802.11n wireless LAN driver utilities.

author:         Broadcom Corporation

srcversion:     418AE02D2004334CCEFD1AA

depends:        

retpoline:      Y

intree:         Y

name:           brcmutil

vermagic:       4.15.0-58-generic SMP mod_unload 

signat:         PKCS#7

signer:         

sig_key:        

sig_hashalgo:   md4



[cfg80211]

filename:       /lib/modules/4.15.0-58-generic/kernel/net/wireless/cfg80211.ko

description:    wireless configuration support

license:        GPL

author:         Johannes Berg

srcversion:     34711E0450EF391760E5E7A

depends:        

retpoline:      Y

intree:         Y

name:           cfg80211

vermagic:       4.15.0-58-generic SMP mod_unload 

signat:         PKCS#7

signer:         

sig_key:        

sig_hashalgo:   md4

parm:           bss_entries_limit:limit to number of scan BSS entries (per wiphy, default 1000) (int)

parm:           ieee80211_regdom:IEEE 802.11 regulatory domain code (charp)

parm:           cfg80211_disable_40mhz_24ghz:Disable 40MHz support in the 2.4GHz band (bool)



##### module parameters #################



[mac80211]

beacon_loss_count: 7

ieee80211_default_rc_algo: minstrel_ht

max_nullfunc_tries: 2

max_probe_tries: 5

minstrel_vht_only: Y

probe_wait_ms: 500



grep: /sys/module/brcmfmac/parameters/alternative_fw_path: Permission denied

grep: /sys/module/brcmfmac/parameters/debug: Permission denied

grep: /sys/module/brcmfmac/parameters/roamoff: Permission denied

[brcmfmac]



[cfg80211]

bss_entries_limit: 1000

cfg80211_disable_40mhz_24ghz: N

ieee80211_regdom: 00



##### /etc/modules ######################



##### modprobe options ##################



[/etc/modprobe.d/amd64-microcode-blacklist.conf]

blacklist microcode



[/etc/modprobe.d/blacklist-ath_pci.conf]

blacklist ath_pci



[/etc/modprobe.d/blacklist-bcm43.conf]

blacklist b43

blacklist b43legacy

blacklist ssb

blacklist bcm43xx

blacklist brcm80211

blacklist brcmsmac

blacklist bcma



[/etc/modprobe.d/blacklist.conf]

blacklist evbug

blacklist usbmouse

blacklist usbkbd

blacklist eepro100

blacklist de4x5

blacklist eth1394

blacklist snd_intel8x0m

blacklist snd_aw2

blacklist i2c_i801

blacklist prism54

blacklist bcm43xx

blacklist garmin_gps

blacklist asus_acpi

blacklist snd_pcsp

blacklist pcspkr

blacklist amd76x_edac



[/etc/modprobe.d/blacklist-rare-network.conf]

alias net-pf-3 off

alias net-pf-6 off

alias net-pf-9 off

alias net-pf-11 off

alias net-pf-12 off

alias net-pf-19 off

alias net-pf-21 off

alias net-pf-36 off



[/etc/modprobe.d/intel-microcode-blacklist.conf]

blacklist microcode



[/etc/modprobe.d/iwlwifi.conf]

remove iwlwifi 

(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) 

&& /sbin/modprobe -r mac80211



[/etc/modprobe.d/mdadm.conf]

options md_mod start_ro=1



##### rc.local ##########################



grep: /etc/rc.local: No such file or directory



##### pm-utils ##########################



##### udev rules ########################



##### dmesg #############################



[    9.895198] Bluetooth: Generic Bluetooth SDIO driver ver 0.1

[    9.959830] bluetooth hci0: Direct firmware load for brcm/BCM4345C0.hcd failed with error -2

[    9.959843] Bluetooth: hci0: BCM: Patch brcm/BCM4345C0.hcd not found

[   10.097059] brcmfmac: brcmf_fw_map_chip_to_name: using brcm/brcmfmac43455-sdio.bin for chip 0x004345(17221) rev 0x000006

[   10.830953] bytcr_rt5651 bytcr_rt5651: quirk DMIC_MAP enabled

[   10.830959] bytcr_rt5651 bytcr_rt5651: quirk DMIC enabled

[   10.830962] bytcr_rt5651 bytcr_rt5651: quirk MCLK_EN enabled

[   10.874739] bytcr_rt5651 bytcr_rt5651: snd-soc-dummy-dai <-> media-cpu-dai mapping ok

[   10.874822] bytcr_rt5651 bytcr_rt5651: snd-soc-dummy-dai <-> deepbuffer-cpu-dai mapping ok

[   10.874986] bytcr_rt5651 bytcr_rt5651: rt5651-aif1 <-> ssp2-port mapping ok

[   10.899701] input: bytcr-rt5651 Headset as /devices/pci0000:00/808622A8:00/bytcr_rt5651/sound/card1/input10

[   11.688608] r8169 0000:01:00.0 enp1s0: link down (repeated 2 times)

[   11.688900] IPv6: ADDRCONF(NETDEV_UP): enp1s0: link is not ready

[   13.128109] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000): clkctl 0x50 (repeated 3 times)

[   16.439948] r8169 0000:01:00.0 enp1s0: link up

[   16.439969] IPv6: ADDRCONF(NETDEV_CHANGE): enp1s0: link becomes ready

[   30.059028] [UFW BLOCK] IN=enp1s0 OUT= MAC=01:00:5e:00:00:01:24:f5:a2:00:89:26:08:00 SRC=192.168.1.1 DST=224.0.0.1 LEN=28 TOS=0x00 PREC=0xC0 TTL=1 ID=3435 PROTO=2 

[  155.311982] [UFW BLOCK] IN=enp1s0 OUT= MAC=01:00:5e:00:00:01:24:f5:a2:00:89:26:08:00 SRC=192.168.1.1 DST=224.0.0.1 LEN=28 TOS=0x00 PREC=0xC0 TTL=1 ID=3437 PROTO=2 

[  279.920593] [UFW BLOCK] IN=enp1s0 OUT= MAC=01:00:5e:00:00:01:24:f5:a2:00:89:26:08:00 SRC=192.168.1.1 DST=224.0.0.1 LEN=28 TOS=0x00 PREC=0xC0 TTL=1 ID=3439 PROTO=2 



########## wireless info END ############

The output of dmesg | grep -i sdio

[    3.699477] mmc1: new ultra high speed SDR104 SDIO card at address 0001

[    9.911273] Bluetooth: Generic Bluetooth SDIO driver ver 0.1

[   10.107255] brcmfmac: brcmf_fw_map_chip_to_name: using brcm/brcmfmac43455-sdio.bin for chip 0x004345(17221) rev 0x000006

[   13.143419] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000): clkctl 0x50

[   14.160121] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000): clkctl 0x50

[   15.164314] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000): clkctl 0x50

Other requested outputs:

$ dmesg | grep brcm

[    9.767200] bluetooth hci0: Direct firmware load for brcm/BCM4345C0.hcd failed with error -2

[    9.767210] Bluetooth: hci0: BCM: Patch brcm/BCM4345C0.hcd not found

[   10.107255] brcmfmac: brcmf_fw_map_chip_to_name: using brcm/brcmfmac43455-sdio.bin for chip 0x004345(17221) rev 0x000006

[   10.111627] usbcore: registered new interface driver brcmfmac

[   13.143419] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000): clkctl 0x50

[   14.160121] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000): clkctl 0x50

[   15.164314] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000): clkctl 0x50

I contacted the Beelink product support and they sent me some drivers, but I can't figure how to install it.

The drivers seem a copy of this repo https://github.com/linux-rockchip/linux-rockchip/tree/mirror/stable-3.0/drivers/net/wireless/rkwifi/bcmdhd

Can anyone give me some hints?