Does it self learn the personality or does it default to empeg.

The personality switch in Logo Editor is not learned from the player. It's simply whatever you select it to be, and it remembers that selection in its INI file.

btw the custom logo must get overwritten, or at least disabled, during an upgrade, because the 2.0b3 logo is very different from the earlier ones.

The custom logo is not overwritten or disabled when the software is upgraded.

You are confusing the custom user-added logo (the one controlled by Logo Editor) with the default boot-up logo which appears before the custom logo (the one built into the kernel).

Your custom user-added logo is not harmed by a software upgrade. Only the default built-in bootup logo is altered with the 2.0b3 upgrade.