How to export classified image to erdas or envi

I have performed a RF classification in my image and I found some miss classification there, I want to recode those miss classified pixel using Erdas but I could not, Because while exporting it in geotiff format class information is being lost.

Please help me to solve the problem

can you specify how the class information is different after exporting to GeoTiff?

You can save the Random Forest Classification in BEAM DIMAP format and then import the img file (ERDAS expects you to select the LabeledClasses.hdr file)
Please check the “Notes on exporting results” chapter of this tutorial:
Landcover classification with Sentinel-1 GRD

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