In Intel® Agilex™ and Intel® Stratix® 10 devices, you may observe Active Serial (AS) configuration failure when the configuration flash device is set to 4-byte addressing mode. This is because Intel Agilex and Intel Stratix 10 devices expect the configuration flash device to operate in 3-byte addressing mode.
A patch is available to work around this problem for the Intel® Quartus® Prime Pro Edition software version 20.1, this will set your configuration flash device to operate in 3-byte addressing mode when you reprogram your configuration flash device using the JIC programming flow.
Download and install patch 0.11 from the appropriate link below.
Download patch 0.11 for Windows (.exe)
Download patch 0.11 for Linux (.run)
Download the Readme for patch 0.11 (.txt)
This problem is fixed in the Intel® Quartus® Prime Pro Edition software version 20.2.