If you own an older Mac, it's easy to wipe the hard drive to prepare it for sale. However, full-scale reset is more expensive on newer models such as the iMac Pro, the 2018 Mac mini, and all MacBook Pro and MacBook Air models released since 2018.
This is due to Apple's new T2 security chip, which adds Activation Lock, another level of security that makes it difficult for thieves to work. That's great, but forgetting to disable the feature that uses the T2 chip before sending your computer to a new user or even sending it in for maintenance will make things harder for you , [1
How to Reset Your T2-Enabled Mac
- First, determine if the activation lock is enabled to save you unnecessary time. To do this, click on the Apple logo in the upper left corner of your screen and then on About This Mac.
- Click System Report. The first screen you see will show your activation lock status (see the red arrow in the photo below). If "Enabled" appears, continue with this guide. If "Disabled" is displayed, you can continue and reset your computer.
- The next step is to open the system settings. Click Apple ID followed by iCloud.
- The Find My Mac feature is listed. Disable this option.
How to remotely reset a T2-equipped device
If you use a browser on another computer, phone, or tablet, you can remotely wipe your T2-equipped device.
- Sign in to iCloud.com in your iCloud account and sign in with the Apple ID associated with that Mac.
- Click the Find iPhone icon (yes, even though it's a Mac).  Select All Devices and locate your Mac in the list.
- Click Delete Mac. After deleting, click the "X" button next to your Mac in the list.
- Now you can sell your device or send it in for maintenance.
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