hmmm... well my modded 80211.sh is no good today...
either way... show some insight... some random errs...
[ 2644.501258] ieee80211 phy0: brcmf_cfg80211_start_ap: Set Channel failed: chspec=57386, -52
[ 2650.524544] ieee80211 phy0: brcmf_cfg80211_start_ap: Set Channel failed: chspec=57386, -52
#Fri Aug 7 17:44:07 2020 daemon.notice netifd: radio0 (8955): + iw phy phy0 set txpower auto
#Fri Aug 7 17:44:07 2020 daemon.notice netifd: radio0 (8955): command failed: I/O error (-5)
#Fri Aug 7 17:44:07 2020 daemon.notice netifd: radio0 (8955): + '[' -n ]
No force 40 and b rates on ( default )
Fri Aug 7 18:35:19 2020 kern.info kernel: [ 4390.387121] device wlan0 entered promiscuous mode
Fri Aug 7 18:35:19 2020 daemon.notice hostapd: wlan0: interface state UNINITIALIZED->COUNTRY_UPDATE
*****Fri Aug 7 18:35:19 2020 daemon.notice hostapd: wlan0: interface state COUNTRY_UPDATE->HT_SCAN
Fri Aug 7 18:35:19 2020 kern.err kernel: [ 4390.393482] ieee80211 phy0: brcmf_run_escan: error (-52)
Fri Aug 7 18:35:19 2020 kern.err kernel: [ 4390.398803] ieee80211 phy0: brcmf_cfg80211_scan: scan error (-52)
Fri Aug 7 18:35:19 2020 kern.info kernel: [ 4390.921464] br-lan: port 2(wlan0) entered disabled state
Fri Aug 7 18:35:19 2020 kern.info kernel: [ 4390.930863] device wlan0 left promiscuous mode
Fri Aug 7 18:35:19 2020 kern.info kernel: [ 4390.935510] br-lan: port 2(wlan0) entered disabled state
Fri Aug 7 18:35:19 2020 kern.err kernel: [ 4390.963329] ieee80211 phy0: brcmf_run_escan: error (-52)
Fri Aug 7 18:35:19 2020 kern.err kernel: [ 4390.968801] ieee80211 phy0: brcmf_cfg80211_scan: scan error (-52)
Fri Aug 7 18:35:19 2020 daemon.err hostapd: Failed to request a scan of neighboring BSSes ret=-52 (No error information)
******Fri Aug 7 18:35:19 2020 daemon.notice hostapd: wlan0: interface state HT_SCAN->DISABLED
Fri Aug 7 18:35:19 2020 daemon.notice hostapd: wlan0: AP-DISABLED
Fri Aug 7 18:35:19 2020 daemon.err hostapd: wlan0: Unable to setup interface.
Fri Aug 7 18:35:19 2020 daemon.notice hostapd: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Fri Aug 7 18:35:19 2020 daemon.notice hostapd: nl80211: Failed to remove interface wlan0 from bridge br-lan: Invalid argument
Fri Aug 7 18:35:20 2020 daemon.notice hostapd: wlan0: CTRL-EVENT-TERMINATING
Fri Aug 7 18:35:20 2020 daemon.err hostapd: hostapd_free_hapd_data: Interface wlan0 wasn't started
Fri Aug 7 18:35:20 2020 daemon.notice netifd: radio0 (13342): Command failed: Invalid argument
Fri Aug 7 18:36:03 2020 daemon.notice netifd: radio0 (13507): Command failed: Invalid argument
Fri Aug 7 18:36:04 2020 daemon.notice netifd: radio0 (13507): command failed: No error information (-524)
Fri Aug 7 18:36:04 2020 daemon.notice netifd: radio0 (13522): command failed: No error information (-524)
Fri Aug 7 18:36:04 2020 daemon.notice netifd: radio0 (13522): command failed: I/O error (-5)
Fri Aug 7 18:36:09 2020 daemon.notice hostapd: Configuration file: /var/run/hostapd-phy0.conf (phy wlan0) --> new PHY
Fri Aug 7 18:36:09 2020 kern.info kernel: [ 4440.089994] br-lan: port 2(wlan0) entered blocking state
Fri Aug 7 18:36:09 2020 kern.info kernel: [ 4440.095335] br-lan: port 2(wlan0) entered disabled state
force 40 and b rates off
Fri Aug 7 18:36:09 2020 kern.info kernel: [ 4440.100813] device wlan0 entered promiscuous mode
Fri Aug 7 18:36:09 2020 daemon.notice hostapd: wlan0: interface state UNINITIALIZED->COUNTRY_UPDATE
********Fri Aug 7 18:36:09 2020 daemon.notice hostapd: wlan0: interface state COUNTRY_UPDATE->ENABLED
Fri Aug 7 18:36:09 2020 daemon.notice hostapd: wlan0: AP-ENABLED
Fri Aug 7 18:36:09 2020 kern.err kernel: [ 4440.110978] ieee80211 phy0: brcmf_cfg80211_start_ap: Set Channel failed: chspec=57386, -52
Fri Aug 7 18:36:15 2020 kern.err kernel: [ 4446.119866] ieee80211 phy0: brcmf_cfg80211_start_ap: Set Channel failed: chspec=57386, -52
Fri Aug 7 18:36:16 2020 daemon.notice hostapd: Remove interface 'wlan0'
Fri Aug 7 18:36:16 2020 daemon.notice hostapd: wlan0: interface state ENABLED->DISABLED
Fri Aug 7 18:36:16 2020 daemon.notice hostapd: wlan0: AP-DISABLED
Fri Aug 7 18:36:16 2020 daemon.notice hostapd: wlan0: CTRL-EVENT-TERMINATING
Fri Aug 7 18:36:16 2020 daemon.notice hostapd: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Fri Aug 7 18:36:16 2020 kern.info kernel: [ 4447.958343] device wlan0 left promiscuous mode
Fri Aug 7 18:36:16 2020 kern.info kernel: [ 4447.962908] br-lan: port 2(wlan0) entered disabled state
Fri Aug 7 18:36:17 2020 daemon.notice netifd: radio0 (13696): command failed: No error information (-524)
Fri Aug 7 18:36:17 2020 daemon.notice netifd: radio0 (13714): command failed: No error information (-524)
Fri Aug 7 18:36:17 2020 daemon.notice netifd: radio0 (13714): command failed: I/O error (-5)
Fri Aug 7 18:36:22 2020 daemon.notice hostapd: Configuration file: /var/run/hostapd-phy0.conf (phy wlan0) --> new PHY
Fri Aug 7 18:36:22 2020 kern.info kernel: [ 4453.570751] br-lan: port 2(wlan0) entered blocking state
Fri Aug 7 18:36:22 2020 kern.info kernel: [ 4453.576100] br-lan: port 2(wlan0) entered disabled state
Fri Aug 7 18:36:22 2020 kern.info kernel: [ 4453.581558] device wlan0 entered promiscuous mode
Fri Aug 7 18:36:22 2020 daemon.notice hostapd: wlan0: interface state UNINITIALIZED->COUNTRY_UPDATE
Fri Aug 7 18:36:22 2020 kern.err kernel: [ 4453.591575] ieee80211 phy0: brcmf_cfg80211_start_ap: Set Channel failed: chspec=57386, -52
Fri Aug 7 18:36:22 2020 daemon.notice hostapd: wlan0: interface state COUNTRY_UPDATE->ENABLED
Fri Aug 7 18:36:22 2020 daemon.notice hostapd: wlan0: AP-ENABLED
Fri Aug 7 18:36:28 2020 kern.err kernel: [ 4459.600639] ieee80211 phy0: brcmf_cfg80211_start_ap: Set Channel failed: chspec=57386, -52
Fri Aug 7 18:36:34 2020 kern.err kernel: [ 4465.622565] ieee80211 phy0: brcmf_cfg80211_start_ap: Set Channel failed: chspec=57386, -52
EDIT: b rates on has no effect... so it's only the force 40... and something to do with how that influences initialisation