After replacing the battery, run AST again. Build 30 includes a “Repair Verification” mode that compares the new serial number (from the replacement battery’s firmware) with the logic board’s record. If they don’t match, AST blocks calibration and prompts the technician to run Apple Configurator 2 for a system configuration update.
The version number "1.5.3" suggests that this is a specific iteration of the Apple Service Toolkit. Software versioning often indicates updates or revisions to the software, with each number representing significant updates, minor updates, and patches or revisions, respectively. Without specific details on what version 1.5.3 entails, it's reasonable to assume it includes a mix of new features, updates to existing features, and bug fixes. Apple Service Toolkit - 1.5.3 30
Apple’s Independent Repair Provider Program grants access to genuine parts, manuals, and AST. Once accepted into the program (requires a signed agreement and online training), you receive a GSX account with AST 1.5.3 build 30 available for download. After replacing the battery, run AST again