Apple has recommended an extra step when erasing the data on your MacBook Pro with Touch Bar before giving it away, that requires an obscure Terminal command which isn’t usually needed on other Macs (via 9to5Mac). While it is not yet clear what Touch Bar data is stored and being erased, Apple says on its website that users should use this command to clear information that the Touch Bar stores in addition to erasing macOS.
The additional step has been highlighted by Apple in its ‘What to do before you sell or give away your Mac’ support guide. Here’s what you need to do:
Start up from macOS Recovery — Hold down Command-R on your keyboard immediately after pressing the power button to turn on your Mac, or immediately after your Mac begins to restart.
When the macOS Utilities window appears, choose Utilities > Terminal in the menu bar. Type this command in Terminal: xartutil –erase-all
Press Return, type yes when asked if you’re sure, and then press Return again.
Finally, choose Terminal > Quit Terminal and proceed to the next step.
This should can clear any information that has been stored by the Touch Bar on your MacBook Pro.