...the BIOS settings will have reverted, but I'm not convinced playing with BIOS will resolve that.
It would appear to be an Intel Management Engine message. The ME is embedded in most Intel processors, runs "behind the scenes", even with the OS powered off (as long as it is still mains connected) and relies on its own firmware. The message implies that this firmware has either been corrupted/unloaded or is incompatible with the recovered machine's now state.
A search reveals that a number of people have encountered this after losing the CMOS battery power, and in some cases it has rendered the m/c unbootable. I haven't found a convincing resolution, however.
Luckily, the Intel ME isn't/shouldn't be at all critical to the normal working of your m/c. I'd be concerned to fix it on an up-to-date, everyday use m/c, but, as long as you can live with the F1 prompt, and it otherwise works, for your use I'd simply live with it.
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