Before running Flashup utility 

Method #1

1) copy new/latest or desired .hex file from release folder to this directory. 
2) remove the current DTR Firmware.hex file
3) rename the new desired hex file to DTR Firmware.hex
4) run flashup.exe

Method #2

1) Start Flashup.exe 
2) Use Hex File button to search and select desired .hex file to be programmed to device.


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Flashup will now program the device with this new desired file.

Confirm .hex file version in Firmware File box is correct, before selecting the Program button