General Fixes and it appears some rather specific bugs fixed.
Meraki APs use UDP port 7351 for cloud communication and TCP ports 80 and 443 for backup communications when running MR 27 and older firmware. When running MR 28+ firmware, Meraki APs will now use TCP port 443 as the primary means for cloud connectivity. In order to maintain connectivity to the Meraki cloud on MR 28+ ensure that TCP port 443 is allowed to communicate with 184.108.40.206/20 on firewalls that are deployed upstream of your Meraki APs. (Wi-Fi 6 and Wi-Fi 6E APs)
Legacy product notice
When configured for this version MR12, MR16, MR18, MR24, MR26, MR32, MR34, MR62, MR66, and MR72 will run MR 26.8.3.
General stability and performance improvements
Disallow RF mode switching for CM64 boards
Intermittent low power mode (MR53, MR56)
SES-imagotag bootloop (MR30H, MR33)
Honeywell printers unable to connect to hidden SSID
Sporadic packet loss & instability on Layer 3 roaming & Teleworker VPN SSID's (Wi-Fi 5 Wave 2 and Wi-Fi 6 APs)
No DHCP response error is seen after a client performs a successful L3 roam (Wi-Fi 5 Wave 2 and Wi-Fi 6 APs)