just checked in the admin console with the latest firmware: I was only able to select up to channel 160 MHz (for 5 GHz-2 / backhaul). Bought mine via Digitec, so I assume it's the EU version.

At the moment, my 2 ZenWiFi AX6600s are limited to a maximum bandwidth of 80 MHz (for the 5GHz range), so channels 36 to 64 can be used. There's currently no firmware update available, and I doubt very much that this router will be able to support channels in frequency ranges above 5330 MHz.