The latest maintenance release (MR15) for SFOS v17.5 is now available through the MySophos licensing portal.
To install, you can download the firmware from the Licensing Portal. Please refer to Sophos XG Firewall: How to move to a different firmware version.
Is this version compatible with APX 320 and 530. Getting a few new AP's and currently running on SFOS 17.5.13 MR-13