GL.iNet GL-X3000/ Spitz AX support

Is there anything additional that needs to be done to get 5G support enabled?
With or without a SIM inserted, mmcli shows only up to 4G LTE supported:

root@OpenWrt:~# mmcli -m 0
...
-----------------------------
  Hardware |      manufacturer: Quectel
           |             model: RM520N-GL
           | firmware revision: RM520NGLAAR01A07M4G
           |         supported: gsm-umts, lte
           |           current: gsm-umts, lte
...
-----------------------------
  Modes    |         supported: allowed: 2g, 3g, 4g; preferred: none
           |           current: allowed: 2g, 3g, 4g; preferred: none