After bypassing a fried opto-isolator on the tertiary I/O bus and rewriting the handshake routine from memory, the service mode finally accepted the override code. A single line blinked on the terminal:
The factory manager stopped shaking. SpaceX got their boards. hdvx9as v41 service mode fixed
button on the remote; the standard LCD menu will appear on the screen. Press the number keys 8, 8, 9, 6 in quick succession. A hidden service menu should now appear on the screen. Navigating and Fixing Settings After bypassing a fried opto-isolator on the tertiary
Service Mode Guide for HDVX9AS-V4.1 Universal Board HDVX9AS-V4.1 button on the remote; the standard LCD menu
Locked service mode. That was new. The v41’s safety firmware had decided that because the EEPROM was corrupted, no one —not even certified engineers—should have access to fix it. It was protecting itself to death.