Brother DCP-T720DW wireless

trying to setup the wireless printer but this happens

and after that the full driver & software package says "your wireless access point/router cannot be detected (TS-02)"

What is the model of router and version of OpenWrt?

Perhaps post contents of /etc/config/wireless (remove security keys). Use </> to format the text.

DCP-T720DW only seems to support 2.4 GHz considering the model is not particularly old. Is the firmware up to date in the printer?

https://forum.openwrt.org/t/how-to-solve-hostapd-dexcessive-deauthenticated-due-to-local-deauth-request/113135/11

If you can't get the DCP to connect, you may have to install a separate wireless access point running stock/OEM firmware for better wifi compatibility. (I personally find 2.4 ghz openwrt wifi to be temperamental)

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TP-Link Archer A6 v3
OpenWrt 21.02.3 r16554-1d4dea6d4f / LuCI openwrt-21.02 branch git-22.083.69138-0a0ce2a

config wifi-device 'radio0'                                                                                                     
option type 'mac80211'                                                                                                  
option path '1e140000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0'                                                        
option channel '1'                                                                                                      
option band '2g'                                                                                                        
option htmode 'HT20'                                                                                                    
option country 'PH'                                                                                                     
option cell_density '3'
                                                                                                                                                                                                                 
config wifi-iface 'default_radio0'                                                                                              
option device 'radio0'                                                                                                  
option network 'lan'                                                                                                    
option mode 'ap'                                                                                                        
option key ''                                                                                             
option ssid 'WIFI 2.4Ghz'                                                                                               
option ieee80211w '1'                                                                                                   
option encryption 'psk2'                                                                                                
option disassoc_low_ack '0'
                                                                                                                                                                                                             
config wifi-device 'radio1'                                                                                                     
option type 'mac80211'                                                                                                  
option path '1e140000.pcie/pci0000:00/0000:00:01.0/0000:02:00.0'                                                        
option channel '36'                                                                                                     
option band '5g'                                                                                                        
option htmode 'VHT80'                                                                                                   
option country 'PH'                                                                                                     
option cell_density '3'
                                                                                                                                                                                                                 
config wifi-iface 'default_radio1'                                                                                              
option device 'radio1'                                                                                                  
option network 'lan'                                                                                                    
option mode 'ap'                                                                                                        
option ssid 'WIFI 5Ghz'                                                                                                 
option encryption 'sae-mixed'                                                                                           
option key ''
                                                                                                                                                                                                             
config wifi-iface 'wifinet2'                                                                                                    
option device 'radio1'                                                                                                  
option mode 'ap'                                                                                                        
option ssid 'WIFI 3.0 5G'                                                                                               
option encryption 'sae'                                                                                                 
option key ''                                                                                             
option network 'lan'
                                                                                                                                                                                                                  
config wifi-iface 'wifinet3'
option device 'radio0'
option mode 'ap'
option ssid 'WIFI 3.0 2.4G'
option encryption 'sae'
option key ''
option network 'lan'

the firmware is up to date 1.14

Turn off 802.11w and see if that helps. Some devices don't play well with that enabled.

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