bluetooth 4.1 device doesn't show up on my iphone 5s
I have a set of PlugFone ear plug/phones and they are running bluetooth 4.1. my 5s doesn't see them????? Is there a way to get 4.1 on my 5s since apparently the PlugFone is not backward compatible?
Thanks.
iPhone 5s, iOS 11.2, Just did a ios update