RMPrepUSB, Easy2Boot and USB booting: Add Lenovo diagnostics and BIOS Updates to E2B
User Guide
Having issues booting SSD, Lenovo diagnostics state the disk is functional : r/thinkpad
How To Create a Lenovo Bootable Diagnostics USB - YouTube
Lenovo Diagnostics Tool – Here's Your Full Guide to Use It
Lenovo Diagnostic Storage test may show “Random seek test FAILED”, “Funnel seek test FAILED”, or “Targeted read test FAILED” with bootable or embedded diagnostics - ThinkCentre/ThinkStation - Lenovo Support US