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Not a problem. I usually have my X plugged in and charging when I choose to start an upgrade. Charging may stop at some points, but it will resume when the upload is done.
Besides, software upgrades usually happen with your consent. When Lord Elon blesses you with an update, a notification pops up asking when you want to install it. Worst case, it'll probably stop charging during the process but I haven't tried it.
all of my updates have been done while I'm charging. nothing bad will happen. Various car systems will shut off and on during the update. what's the concern, exactly?