Cvm tool

cvm_tool was released by roxfan in 2010. It can split the .cvm into a header and ISO file. You can then edit the contents of the archive and create a new ROFS image.
The tool can be found here

Usage

Use the following commands to:

• Extract ISO file from a ROFS image:
  split [-p <password>] <file.cvm> <file.iso> [<file.hdr>]
• Create a ROFS image from an ISO file and header file:
  mkcvm [-p <password>] <file.cvm> <file.iso> <file.hdr>

For Linux

You can build cvmtool by cloning this repository.

• Go to the cloned repository directory and create a new directory for building and go there.
• Use the command cmake .. then make
• Use the commands above with cvm_tool before them.