1. Your problem can be from the enabled Security Boot function.
2. You shall take into consideration that if the Bios update was performed using Bios recovery method (with security jumper removed), Trusted Platform Module (TPM) keys, Intel® Platform Trust Technology (Intel® PTT) keys, and High-bandwidth Digital Content Protection (HDCP) keys where cleared. These keys are not restored after the BIOS recovery.
3. Try to disable the Security Boot option in Bios and see if this problem still exists.