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Think about this from the manufacturer's perspective. People that have no clue are modifying programming parameters that they think "shouldn't" affect anything else and maybe they don't but sometimes they do cause issues. Point is the manufacturer has to work from a known baseline with no known variables and the manufacturer is probably tired of eating "warranty" work.
As for the tech he's probably pissed b/c he's making less money by not working on the next car b/c he has to deal w/ghost issues that may or may not be owner caused.
Land Rover won't even work on a car unless it has the current software installed, which great while under warranty but once out it costs a couple hundred bucks to update the car before they even look at your problem.
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