https://community.sophos.com/sophos-xg-firewall/b/blog/posts/sophos-firewall-v18-5-mr3-is-now-available
Release Notes: https://docs.sophos.com/releasenotes/output/en-us/nsg/sf_185_rn.html
"Old" V18.5 MR2 Thread: https://community.sophos.com/sophos-xg-firewall/b/blog/posts/sophos-firewall-v18-5-mr3-is-now-available
Uploading HW-18.5.3_MR-3.SF300-408.sig to XG125 (18.5.1) as inactive image will crash and reboot the appliance :-/
I think I've found a new bottom with XG firmware updates. I mean I hardly remember any release without any significant issues.
Not a good message. Did you experience this for only one device or did you try the same with another one?
Tried on 115 and 125 and both upgraded just fine. I will dig deeper with the problem one. But it seems like HW issue to me.
So it's "fixed" ... updated to 18.5.2 via internal Install button and rebooted the new fw. Then manual upload of 18.5.3 as inactive image worked and booted just fine.
Thanks for the update.