I know that RsrcEdit and AppIcon can do the job for modifying ioncs of apps installed in RAM, but how can I modify or use another app icon overlay for those apps installed in ROM? 'Cause most of the ROM apps have already had their app icon overlays, which cannot be modified. I don't have a flash rom either on my SJ30 so I cannot use flash utilities to remove these default app icon overlays.
I know ZLauncher has a default app icon file which is used for ZLauncher to display hi-density icons for some ROM apps. Is there any other way that I can use my own app icons instead of using the default one installed in ROM?