I have done a video on the process step-by-step, using SRecord instead of WinHEX ($$$). I wish I had seen Jope's post first before wasting an hour trying to get the syntax correct for srec_cat.exe. Had to educate myself on the difference between "Word" splitting and "bit" splitting. As an alternative, I used the tried-and-true Windows copy command to concatenate the images.
Video here:
[ Show youtube player ]
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