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About the compatibility of the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter
Learn about the devices and connections that work with the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter.
The Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter allows you to connect your late-2016 MacBook Pro with Thunderbolt 3 (USB-C) ports to Thunderbolt (10Gbps) or Thunderbolt 2 (20Gbps) devices. For example, you can use this adapter to connect your MacBook Pro to an Apple Thunderbolt Display or a third-party Thunderbolt 2 storage device.
And, the Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter is bidirectional, so you can connect Mac computers with Thunderbolt or Thunderbolt 2 ports to new Thunderbolt 3 devices.
The Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter isn't compatible with MacBook (Retina, 12-inch, Early 2015) and later.
Using the adapter with your late-2016 MacBook Pro
You can use the Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter to connect your late-2016 MacBook Pro to these devices:
Mini DisplayPort Thunderbolt displays
Mini DisplayPort Thunderbolt bus-powered devices
Mini DisplayPort Thunderbolt self-powered devices
Mac computers that have Thunderbolt or Thunderbolt 2 (Mini DisplayPort)
Apple Thunderbolt to Gigabit Ethernet Adapter
Apple Thunderbolt to FireWire Adapter
Support for Apple Thunderbolt to FireWire Adapter is limited to devices that require less than 10W of power.
The Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter doesn't support connections to these devices:
Apple DisplayPort display
DisplayPort devices or accessories, such as Mini DisplayPort to HDMI or Mini DisplayPort to VGA adapters
4K Mini DisplayPort displays that don’t have Thunderbolt
Using the adapter with your Mac that has Thunderbolt or Thunderbolt 2 ports
Your Mac must be running macOS Sierra to work with the Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter.
You can use the Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter to connect your Mac with Thunderbolt or Thunderbolt 2 ports to these devices:
Thunderbolt 3 (USB-C) self-powered devices, such as Thunderbolt 3 displays and Thunderbolt 3 self-powered hard drives
Mac computers that have Thunderbolt 3
The Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter doesn't support connections to these devices:
Thunderbolt 3 (USB-C) bus-powered devices
USB-C devices, displays, and adapters that don't have Thunderbolt
https://support.apple.com/en-us/HT207266
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