ID:253002 Intel recommends removing all location assignments when changing the device. Do you want to remove all location and I/O standard assignments?

CAUSE: In the Device page of the Settings dialog box, you selected a new device for the project from the Available devices list. The Quartus Prime software is asking if you want to remove all location and I/O standard assignments for the previous device.

ACTION: Click Yes to delete all location and I/O standard assignments and change the device, click No to change the device without deleting the location and I/O standard assignments, or click Cancel to retain the current device and assignments.