Internal Error: Sub-system: BITASM, File: /quartus/pgm/bitasm/bitasm_update_main_descriptor.cpp, Line: 180. OPN Specification U is not mapped to SKUID - Internal Error: Sub-system: BITASM, File: /quartus/pgm/bitasm/bitasm_update_main_descriptor.cpp, Line: 180. OPN Specification U is not mapped to SKUID Description Due to a problem in Quartus® Prime Pro Edition Software version 26.1, you may see this internal error when trying to provision a root key (.qky) or AES root key compact certificate (.ccert) into an Agilex® 3 FPGA device. Resolution To work around this problem, generate a helper image (.rbf) for your specific Agilex® 3 FPGA variant and configure the FPGA with the generated helper image prior to provisioning the .qky or .ccert file. For example : quartus_pfg --helper_image -o helper_device=A3CY100BM16A -o subtype=PROVISION provision_helper.rbf quartus_pgm -c<n> -mjtag -o "p;provision_helper.rbf" --force quartus_pgm -c<n> -mjtag -o "p;root.qky" This problem will be fixed in a future release of the Quartus® Prime Pro Edition software. Custom Fields values: Troubleshooting QS-603903 novalue ['FPGA Dev Tools Quartus® Prime Software Pro'] novalue 26.1 ['Agilex® 3 FPGAs and SoCs']