I don't think it's a coding issue, although I do have the capability to do coding.

I have seen some very strange instrument cluster behavior when the battery is very weak. I also had an '06 and the battery was totally dead when I bought it. Even after charging, I would get strange random messages (in German) and other general weirdness. But in that case, a fresh battery cured it 100%.

That's why I immediately suspected the battery in this case. But I'm getting good voltage and have confirmed that the alternator is charging. I'm not saying that I'm convinced the battery isn't the problem, but it seems unlikely to me...

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2002 X5 4.6is - Imola Red/Black (Sold)
2001 740i M Sport - Anthrazit Metallic/Black (Sold)
1998 M3/4/5 - Technoviolet/Dove (Sold)
2003 Z4 3.0i Sport - Sterlinggrau Metallic/Black (Sold)
2009 Mini JCW (The Wife's)
2015 i3 REx - Arravani Gray/Tera World (Daily Driver)