Why does the setting of Configuration device I/O voltage revert back to Auto? - Why does the setting of Configuration device I/O voltage revert back to Auto? Description Due to a problem in the Quartus® II software version 15.0.2 and earlier, the setting of Configuration device I/O voltage under Device and Pin Options may revert back to Auto . You may see this problem when you change any settings of Device and Pin Options except for Configuration device I/O voltage . Resolution To work around this problem, set the Configuration device I/O voltage after changing other settings. This problem has been fixed beginning with the Quartus Prime software version 15.1 Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']