About Blender Hirise DTM Importer making Martian terrain。

I saw it on the github website, it can be used for Blender Hirise DTM Importer plugin of Blender 2.8+ version
I followed the HiRISE DTM Importer for Blender tutorial and downloaded the .IMG file and .JP2 file from the HiRISE website and imported it into Blender 2.9. When I opened the EEVEE and Cycles renderers, the materials could not be displayed normally.
Excuse me, how do you make it? Can you share a tutorial on how to use Blender Hirise DTM Importer to create Martian terrain and add new materials in Blender 2.8 or Blender 2.9?
Download link of Blender Hirise DTM Importer plug-in that can be used in Blender 2.8+

HiRISE DTM Importer for Blender

To use textures on the generated hirise mesh you need to apply a node material that looks like the image below. I’m not sure if Blender reads JP2 files.

Can you tell me how to use QGIS software to load the DEM file of HiRISE website and export the gray height map?

I cannot help you with that, sorry.