Now I note something. I tried to do the upgrade using remote sets.
The bsd.rd prompts do not ask me anything for configuring the interfaces and I get the same answer:
Unable to connect using https. Use http instead [no] yes Unable to get a verified list of distribution sets. ... << I oversaw this before, because I booted bsd.rd with pxeboot and there was no problem with the connection with the local server. The interface was configured. I thought it at least. How is it suppoed that the interfaces are configured with the installer when upgrading? Thanks Rodrigo