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Debugging DFU in IAR - SDK12

I am trying to debug the DFU in IAR. I realize I will have to turn optimization off and grow the flash size in the linker file. However, when flashing as is I get the following error:

Mon Nov 07, 2016 12:36:35: ELF/DWARF Error: Unsupported .debug_info format version: 4

Do you know of any solutions?

Thanks, Ben

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