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Updated for 5.0.0 and newer releases
Deleting a single device is as easy as clicking the delete icon on the Devices List or Devices Read pages.
Deleting multiple devices is easy to do The easiest way to do this is using the Bulk Edit functionality. Set the device Status to Deleted. Then go to menu → Admin → Database → List Tables. Select the Devices table. On that page will be a Delete button for all devices with a Deleted status. Click it. Done 
- Go to the devices view. Manage → Devices → List Devices.
- Use the search and or filter to find the devices you want to disable.
- Check the checkboxes on the right of the devices to select them - the check box at the top will select all visible ones.
- Click the "Bulk Edit" icon on the top of the checkbox column.
- Change the Status field to Deleted and click the green 'Submit' button to save.
Go to menu -> Admin -> Database -> List Tables.
Click the 'devices' table details icon.
You'll see various options for deleting rows (devices) from the database on that page. Click the RED Delete button in the Device Status: Deleted row.
- Done
And don't forget if you're using the JSON API, you can send a DELETE request to /open-audit/index.php/devices/ID where ID is the id of the device to delete. This can be wrapped in a loop to delete an array of devices, quite easily.
Pre 5.0.0
There are three scenarios.
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