Unassigning Devices in Apple School Manager or Apple Business Manager
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Log in to Apple School Manager or Apple Business Manager.
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Click Device Assignments in the sidebar.
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Under Choose Devices, select "Serial Number" and enter the serial number of each device to be unassigned into the text field, separated by a comma.
Note: Alternatively, you can select "Upload CSV File" and upload a comma-separated value (.csv) file that contains the list of device serial numbers to be unassigned.
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Choose "Unassign Devices" from the Perform Action pop-up menu and click Done.
The devices are no longer assigned to an MDM server and will not enroll into MDM the next time they are set up.