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I took my 535 in for an oil change last week and asked them to check all the software, etc to see if there were any upgrades on my non-NAV version. My coding is still working so I assume they didn't have to (or didn't bother) updating anything.
I suppose this means I would be okay with a retro-NAV install. There is no way in hell I would be able to take it out before going into the dealer in the future.
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2023 G05 X5 x40i Phytonic Blue
....many prior BMW's back to a 1966 1600
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