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Module updates are not a recommended DIY due to the complexity of the process. You need the appropriate software files, ICOM hardware and a battery tender to keep the car powered up while the update happens. The margin for error and risk of bricking modules is not worth the risk, and more often than not the module firmware updates bring no noticeable changes.
To add to that every time I have asked BMW to perform module updates the make me sign a disclaimer since modules could brick during the update process even with all the correct hardware and software.
If it ain't broke, don't fix it...
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