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I haven't had to do this myself, but I believe you will need to change options in Bimmercode to force the ECU to recognise the bulbs as being LEDS rather than Halogen. You can also turn off the Active Monitoring for each bulb within the same menu. You will get dashboard error codes otherwise.
The headlight units themselves should be a relatively easy swap as they will use the same fittings.
I saw a video a few days ago on Youtube which covered the 'Top 10 things changed in Bimmercode', I can't find the correct one now but one of them covered the bulb code changing process. You don't need to go into Expert mode, they are in the standard options.
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