Apple Service Toolkit - 1.5.3 30 Instant

For T2 Macs (2018-2020), you must boot into Recovery (Cmd+R), go to Startup Security Utility, and set:

Apple Service Toolkit (AST) 1.5.3 30 is a specific version of Apple’s proprietary diagnostic software suite used by Apple Authorized Service Providers (AASPs) and internal technicians to troubleshoot hardware and verify repairs. While the newer, cloud-based Apple Service Toolkit - 1.5.3 30

If you are an authorized technician:

The toolkit is an exclusive suite used by to verify hardware health. It works by communicating directly with Apple's servers to run live tests on sensors, battery health, and Apple Pay modules. For T2 Macs (2018-2020), you must boot into

Your (e.g., self-service repair user, AASP technician). For T2 Macs (2018-2020)