The LT-TB has two complete copies of firmware so there is no risk of “bricking” your Thunderbolt card when flashing new firmware.
Tools required: Phillips head screwdriver.
In the unlikely event that programming new firmware onto your LT-TB keeps it from starting up properly, it is a fairly straight-forward process to switch the unit to start using the backup factory firmware (which cannot be overwritten by the end user).
1. Disconnect power from Hilo.
2. Remove seven screws from top cover.
3. Remove top cover.
4. Locate SW1 nearest on the LT-TB board in shown highlighted in the image above. The factory default position has PROM 2: ON and PROM 1: OFF as shown below:
5. Change SW1 position 4 to OFF and SW1 position 3 to ON. This will enable the LT-TB to start on PROM 1 instead of PROM 2.
6. Temporarily replace the top cover so there is no chance of coming in contact with any powered electronics.
7. Reconnect the AC power to the Hilo.
8. Power up the Hilo and program the LT-TB PROM 2 firmware using the “LynxFirmware” update application.
9. Once the firmware on PROM 2 is successfully programed: disconnect power from Hilo, remove the top cover; change SW1 back to PROM 2: ON and PROM 1: OFF to have the LT-TB start on PROM 2.
10. Install top cover by attaching with seven screws removed in step 2, above.
11. Connect to AC power.
12. Verify the LT-TB starts on PROM 2.