Reimage Sophos Firewall page not accurate

Reimage Sophos Firewall support page advise to connect a monitor to the Firewall.  An XGS2100 does not have a monitor port.  Document does not advise what to do for this situation

https://docs.sophos.com/nsg/sophos-firewall/19.5/Help/en-us/webhelp/onlinehelp/AdministratorHelp/BackupAndFirmware/Firmware/FirmwareReimageXGFirewall/index.html#reimage-sophos-firewall_1