ID:20797 When you disable Battery Backup RAM for encryption key storage, you must specify the eFuses or Physical Unclonable Function option for the Encryption Key Storage Select parameter on the Security menu.

CAUSE: Cannot disable encryption key in Battery Backup RAM if Encryption Key Storage Select is Battery Backup RAM.

ACTION: Set Encryption Key Storage Select parameter on the Intel Quartus Prime software Assignments > Device and Pin Options > Security menu to eFuses or Physical Unclonable Function.