Mac Startup Security Utility Failed — What It Means & How to Fix It

Fix macOS Startup Security Utility errors on T2 Macs when changing boot security settings, external boot, or Secure Boot configuration. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Startup Security Utility controls Secure Boot and external boot policies on T2 and Apple Silicon Macs. Failures can prevent changing security settings needed for booting Linux, external drives, or older macOS versions. On T2 Macs, access via Recovery Mode (Cmd+R at startup) > Utilities > Startup Security Utility. On Apple Silicon, similar settings are in System Settings > General > Startup Disk or Recovery Mode. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Firmware password is set and preventing changes to security settings. T2 chip firmware is corrupted or outdated causing communication failures. FileVault is enabled and the recovery key is required before security changes. Internet Recovery failed to verify the Mac's identity with Apple's servers. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Boot into Recovery Mode: hold Cmd+R (Intel) or hold power button (Apple Silicon) at startup. If firmware password is set, enter it when prompted before accessing Startup Security Utility. Try resetting NVRAM: restart and hold Cmd+Option+P+R for 20 seconds (Intel Macs only). If T2 firmware is corrupted, use Apple Configurator 2 on another Mac to revive/restore via DFU mode. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Mac Error Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.