Apple Service Toolkit - 1.5.3 30 May 2026

Accessing AST requires authorization. Apple restricts it for three reasons:

Apple Service Toolkit is a lightweight, network-bootable diagnostics operating system designed exclusively for Apple Authorized Service Providers (AASPs) and Apple Store Genius Bar technicians. Unlike the consumer-facing Apple Diagnostics (accessed by holding D at startup), AST provides granular control over hardware testing, including: Apple Service Toolkit - 1.5.3 30

While consumer diagnostics return a simple reference code (e.g., ADP000 for no issues), AST reveals the raw data—serial numbers, firmware versions, sensor readouts, and detailed pass/fail logs. Accessing AST requires authorization

---

Download the AST_1.5.3_30.dmg from GSX. Inside, locate the AST_1.5.3_30.iso or .img file. Use Terminal: While consumer diagnostics return a simple reference code (e

sudo dd if=/path/to/AST_1.5.3_30.iso of=/dev/rdisk2 bs=1m

Warning: Double-check your disk identifier. Wiping the wrong drive is irreversible.

After authentication, the toolkit will auto-detect the Mac model and present a suite of tests: