To update an MX, MBX, or TLX family instrument: 1. Install the GEMProgrammer application by running the GEMProgrammer Installer program. This is used to update the LCD GUI. 2. Turn the instrument off, if it is not already off. Connect it to your PC using a USB A/B cable. Turn the instrument on while holding down the standby button on the front panel, and continue to hold down the button for ten seconds. The standby button should start to glow, slowly fading back and forth between green and amber. This signals that the instrument is running the bootloader and is ready to receive software updates. The LCD screen should come on and display the Thorlabs logo. See the included file "Updating the MX Family Firmware.pdf." 3. Run the Thorlabs Firmware Update Utility version 1.5. Follow the instructions on the screen to open the SREC file, which contains the application firmware, and install it. Make sure to follow all the on-screen instructions and finish by using the "Restart" button, or the firmware installation will not be completed. The instrument should restart and the standby button should display a steady amber color. 4. Turn the instrument off and back on again, the same as in step 2, above. You should again see the standby button fading back and forth between green and amber, and the LCD screen should again display the Thorlabs logo. 5. Run the GEMProgrammer application. It will take some time to open. 6. Choose the "Open..." command from the File menu and select the PDB file, which contains the firmware for the LCD screen. GEMProgrammer should show that it is loading the file, and display a message indicating it is ready to program the flash. 7. Use the "Program Flash" button in the lower right corner of the GEMProgrammer window to send the firmware to the LCD screen. This will take several minutes. 8. If the programming fails, it is probably because GEMProgrammer is not using the right COM port to communicate with the LCD screen. Select the "USB/RS232" command from the Settings menu. Select "USB" as the Comm Type. In the list of ports, you should see a port with a number higher than COM4, such as COM15 or COM30. If you don't see it, wait a moment and press the Refresh button. It may take a moment or two for your PC to install the driver for the LCD screen and show it as an available COM port. If it does not show up after a minute or so, double-check your USB cable connection, try repeating step 4, and look for the port again. 9. When the LCD firmware update is complete, the screen will show a series of calibration targets. Use a soft object such as a pencil eraser to touch each of the targets. This calibrates the touch screen. 10. You will need to turn the instrument off and on again one more time. The instrument should restart and the standby button should display a steady amber color. Press the button and the instrument should wake up and display its home page. On the home page, press the MENU button on the right side, then touch SYSTEM INFORMATION. 11. Verify that the reported Firmware Revision and Interface Revision match the versions you just installed. On some units, the Bootloader Revision may show "N/A" (not available). This is because prior to bootloader version 1.6, the bootloader did not have the ability to report its version number to the firmware. All other bootloader functionality is the same. 12. For a guide to the new features added in firmware revision 1.6, see the Remote Control User's Guide. 13. If you encounter difficulty, please contact Thorlabs Technical Support at 1-973-300-3000.