According to your information, the adapter works bidirectionally, so that an external hard drive with a USB C interface can be connected via the adapter to the computer with a Thunderbolt two interface. A Thunderbolt two cable must then be connected between the adapter and the computer. Unfortunately, this does not work. I have also read in other forums that the adapter is not bidirectional. So if you don't have another solution for me, I would have to return the product. Thank you very much!

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I have used the adapter in different ways:
1. Mac mini with Thunderbolt 1 port -> Thunderbolt 1/2 cable -> adapter -> Thunderbolt 3 hard drive (USB-C port).
2. MacBook Pro with Thunderbolt 4 (USB-C port) -> adapter -> Thunderbolt 1/2 cable -> Thunderbolt 1 hard drive

Both work flawlessly. It is important to understand that the adapter can only and exclusively connect Thunderbolt ports. A USB-C port on a hard drive does not necessarily mean that it belongs to a Thunderbolt interface. Most of the time, a USB-C connection hides a USB 3.1 interface, which is already much more performant than USB 2.0 interfaces, but does not understand the Thunderbolt protocol. You can usually recognise Thunderbolt-compatible ports by a lightning symbol. The cables must also be Thunderbolt (with lightning symbol), otherwise the communication will not be adjustable. A pure USB-C cable is NOT sufficient!

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