Well, it works as expected nonetheless
Then we can start from there, And would love to see the logging on the RB.
Besides:
- Why is there a second bridge (I prefer to use VLAN: > Using RouterOS to VLAN your network )?
- Why are there address lists (there is no firewall)?
- Why are there (so) many security profiles?
- Why set 40MHz bandwidth on 2.4GHz radio (you know it will interfere)?
- Why didn't you set wireless-protocol on the 5GHz radio?
\
- I'm going to use VLANs maybe when I buy another MK device, or a VLAN capable switch. Besides, many don't like use VLANs for security reasons (not my case though), and it wouldn't make any sense in my case. It would be overkilled.
- ?? off topic
- ?? off topic
- Interfere? How? I didn't notice any problem before.
- What? Off topic anyway.
In your case I would reset the RB, without configuration and then choose "HomeAP dual" from the Quickset. Get rid of WPA (choose WPA2-AES only) and continue from there.
Tip: never touch Quickset after primary config.
Resetting my RB just to make ONE old device's wifi card (or whatever) work (which even is not mine)? Are you serious? No way! Tons of setup there:
- Port forwarding for a few services running on my server,
- OpenVPN
- WAN recursive failover (which works like charm and I DO need it!)
- script to switch to different DNS servers in case the primary one goes occasionaly down
- subnet isolation
and a few others I even don't remember at the moment (yes, this might be a problem really 
)
Come on, dude! I know that my mk device doean't have a state-of-the-art, perfect setup, and it can look a bit messy, but everything does its dirty job.
I'll maybe reset it when I switch to a stable , reliable V7 OS.
Thanks