@rodri hi... it seems you‘ve missed our announcements and the fact that you can‘t upgrade from anything before version 6.0 (which is the current latest release). So you‘ll have to do a clean instsllation.
I thought something like that might have been the issue. Thanks!
Try to a new install, because the upgrade don´t work online.
Choose your hardware:
Remember to backup your roms before to install a new version on sdcard to put again after.
Yes, thanks for the reminder, I have both the roms and the theme to backup. I was trying to avoid that, because everything is on the same SD card.