Update on my post in March last year:
I'm just coming up on the next oil change (1000 miles to go) and have noticed that the date has changed to the correct month (November 2022) at some point. Possibly, it happened when I had the brake fluid changed at the end of August. The car would have been connected to BMW's system at that time and maybe that's what did it.
Anyway, the coding obviously works as both the miles and the date are now correct and it survived being connected to BMW, as well, without getting reset back to 20,000 miles.
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