Reading RCM data problem

sorry, this was not clear to me.
Have you tries adding the ROI after multi-looking or terrain correction?

@EarthObs the naming conventions for RCM data would be here (under ā€œBeam mode mnemonicsā€):

Not sure if anyone is still having RCM reading problems. In SNAP 12, certain RCM datasets were not opening for me again. However, installing the Radarsat Toolbox Polarimetry plug-in made RCM appear on the ā€œImportā€ → SAR sensors Menu. And that function successfully opened the data : - )