The AP firmware 11.0.018 has been released for Sophos Firewall OS (SFOS). This pattern update has a fix for APX 120 update issue which was discovered during AP Firmware 11.0.017 release.
News: Maintenance ReleaseBugfixes: NAF-143: APX120 firmware upgrade fails after upgrade to WiFi Firmware 11.0.017 and APX120 will become inactiveSFOS Firmware Version: This release is available to SFOS firewalls running the following firmware versions:
AP Firmware 11.0.018 is not available for me.
I upgrade to 11.0.017, and 11.0.018 is not offers.
11.0.018 appears after some time.
It is very strange, we must upgrade to 11.0.017 (which is broken), and after, upgrade to 11.0.018.
Why not upgrade from 11.0.016 to 11.0.018 ?
11.0.017 is no more broken, it is fixed and you may move ahead with update without any issue.