Did you buy the unit directly from Eonon? Their website has live chat and I found them pretty responsive whenever I had issues with the eonon on my E39.
www.eonon.com
The downside is the time difference- they're online after 10pm Pacific Time. Also Alice their customer service rep responds promptly to emails. It sounds like you're dealing with an Eonon reseller?

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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.