Cvm tool

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cvm_tool was released by roxfan in 2010. It can "split" the CVM into separate header and ISO files, so that you can edit the contents of the archive and then "make" a new CVM.
The tool can be found here


First, you need to extract the tool and the ROM on the same folder
Second, run Command Prompt as administrator then type cd /d your_folder_directory
Then use the following command to:
Output an ISO file for you to edit:
cvm_tool.exe -p archive_password split file.CVM file.iso file.hdr
Use this to repack your CVM back:
cvm_tool.exe -p archive_password mkcvm file.CVM file.iso file.hdr