Different kind of support concern from yours, but also noteworthy. Really unfortunate.
I still have an old HP EliteDesk (i5-8600t) that is my one reliable 24/7 system, still runs fine. Also no bios updates, so I guess there's that. Mini-PCs to me started more as a way to buy cast-off business gear, these small affordable small business systems, even cheaper second hand. It's amazing and great seeing this new market rise up to make interesting mini-pc's, and the value is often still pretty good, but it's a very different character from where the trend started.
If it’s an EliteDesk G2 Mini, the last BIOS update was released in May 2024.
I thought it would be moot, because I vaguely remember HP starting to require support contracts for bios updates. But I guess that only applies to HP Enterprise gear? Yuck, what a pox.
This is especially frustrating because I have an ancient dell optiplex and dell precision with i3-2100 and i3-5xx that still work. I occasionally need to open the box to reseat the ram for whatever reason after a power failure but by an large these machines are over ten years old!