Hi XG Community!
We've released Central Management 2019.30 for Sophos Central.
Having learn not to be too picky, we gonna take all good news coming from Sophos.
Firmware Update only works with XG V17.5 MR7 to MRx.
So actually you need MR7 to use this feature and currently there is no MR8.
Just to be sure, in Case you start looking for this feature right now :)
Older Firmware Version (MR5 for example) displays a alert, only MR7 and above is supported to Upgrade via CM.