FM blob confirmed byte-perfect and reproduces the identical no-lock symptom seen on DAB, strengthening the hardware-side hypothesis over firmware. PCBWay closed the dispute without X-ray verification. Records the BT1035 AT-init root cause (software, not hardware) as a calibration note against over-attributing intermittent symptoms to physical damage. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>