Is Bluetooth 5.0 compatible with Bluetooth 4.0?

Question

Bluetooth

I took JBL Tune 125BT headphones

https://market.yandex.kz/product--besprovodnye-nau...

By TX Bluetooth 5.0, they connect perfectly to the iPhone XS, which has just Bluetooth 5.0

But to laptops and old phones with Bluetooth 4.0 does not connect in any way, it's just that devices do not see these headphones.

Maybe I'm doing something wrong? I connect to a MacBook with Bluetooth 4.0, maybe it's MacOs? but other Bluetooth devices connect perfectly to it

wherever I read they write that they are backwards compatible with 4.0, somewhere they write [1,2] can only 4.1 and 4.2? Wiki writes that it is generally completely backwards compatible ...

Answer 1

Host with BT 5.0 can work with devices on older versions of BT, but not vice versa