There are a host of knock off BMW head units available and only a few are supported within the US. I know the appeal of the discounted price is high but if anything happens how do you get a) service or b) your money back?
I have researched this lately and came across one person who returned a defective unit for refund and the Chinese Customs seized and destroyed his returned defective unit. If you want any of these units then a US based supplier offering US based support, repair and return policies is your best bet.
Stay away from the "cheap" offerings as they can turn out very expensive in the end.

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i