Updated to 2024.07.01. Memory Info right after updating, attached.
Factory reset with/without restoring settings and restarting does not solve it. The tuners will just not work and nothing will play. The message is "Service unavailable! Check tuner configuration!". The Backup Suite works fine and restoring the 2024-06-09 backup makes everything work again.
Not a huge problem, I'll just stop updating. I know it's an old decoder and don't expect miracles. Many thanks for all your work!