Closes the identification chain: firmware has no Prolific driver, a laptop answers on that cable where the Micromate does not, lsusb reported PL2303, purchasing history shows both FTDI and Prolific cables in circulation, and the physical cable on the bench is a Benfei. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Ru8Lg9HkkYvX9VWWo65SmL