I've lost Sophos Central management of the XG230 firewall after upgrading.

As stated, I've lost Sophos Central management of the firewall after upgrading to v18.

All I obtain now is a white webpage when I try to connect to the Firewall from Sophos central.

I'm thinking of unlink it and link it again should do the trick. 

¿any thoughts?

 

P.S. [OFFTOPIC] I've tried but it seems impossible to upgrade a Virtual XG HOME to v18.