Valerio Forza

Hi Cormac On sdx starting from 11.1 you can have different version of firmware, usually the VPX are more update that the SDX firmware. For a while we had SDX 15120 ( fimware 13.0 build 58.30) with VPX instance based on firmware 12.1.xx. https://docs.citrix.com/en-us/citrix-hardware-platforms/sdx/sdx-hardware-software-compatibility-matrix.html. Any combinations of SDX image version and VPX image versions are supported as long as they meet minimum version requirements for a particular hardware platform. @Andrew The 12.1 firmware is 64-bit OS starting from 12.1 Build 48.1. Check the last version name build-12.1-65.25_nc_64.tgz