Why do I see Active Serial (ASx4) programming and verification failure when using Intel® Quartus® Prime Pro 18.1 or later? - Why do I see Active Serial (ASx4) programming and verification failure when using Intel® Quartus® Prime Pro 18.1 or later? Description You may see ASx4 programming and verification failure on Intel® Stratix® 10 devices when using Intel® Quartus® Prime Pro 18.1 or later with the following flash devices: Micron* N25Q Intel® EPCQ-L Resolution To work around, add the following variable into your quartus.ini file within the project directory: PGM_QSPI_FAST_PROGRAM=OFF If you do not have a quartus.ini file, use a text editor to create it, add the above variable and save this file as quartus.ini into your project directory or \bin64 (Windows) or /linux64 (Linux). Custom Fields values: ['novalue'] Troubleshooting 1408855990 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] novalue 18.1 ['Stratix® 10 FPGAs and SoCs'] ['novalue'] ['Configuration Device EPCQ-L', 'Configuration Devices', 'Configuration Device EPCQ-L', 'Configuration Devices'] ['novalue']