I found objcopy.exe in my GNU Embedded tools. So I ran the following from the cmd prompt
C:\Program Files (x86)\GNU Arm Embedded Toolchain\10 2020-q4-major\arm-none-eabi\bin>objcopy.exe -O binary "C:/Eclipse/PanelDueFirmware/Release-v3-4.3/PanelDueFirmware-v3-4.3.elf" "C:/Eclipse/PanelDueFirmware/Release-v3-4.3/PanelDueFirmware-v3-4.3-nologo.bin"
Output was a no logo bin that I have now flashed to the paneldue. after a reset it opened right up.
A bit of ass pain, but it worked.