Ok you can see it's creating a new BE for 23.04 each time you try to upgrade. It's probably booting into that but fails to boot fully for some reason so it's reverting to the old BE. You should be able to see that happening at the con sole though?
@newUser2pfSense said in 24.03 upgrade: efibootmgr fails:
pkg-static: An error occured while fetching package
pkg-static: An error occured while fetching package
Errors like that are something we can work with. That should have shown when you ran pkg-static -d update though. And that should give more debug output showing why it's unable to fetch those packages.
If you run those commands vi aSSH you can just copy/paste the output.