Contacts only show on Head Unit

I have an Android Head Unit from good ole China SWM8802, and everything works as it should, sort of. I synced my contact list over Bluetooth and later got a notification on the unit stating that the number of contacts deleted had been exceeded. I originally clicked cancel, but when it came up a third time I clicked ok, and now my contacts no longer exist in my phone. The full list shows when my phone is connected to the unit, but only on the unit. Is there a way to get the list back to my phone from the unit without rooting, or is that the only option? I have a Galaxy S8 running Oreo, and the unit has a modded form of what appears to be Lollipop with an Mt8127 processor. Thanks in advance.

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