Upgrade CMG-DCM firmware from before 2007

If you have not upgraded your unit since February 2007, then you must follow this procedure before any of the above methods. This fixes an error in earlier versions of the ipkg program, used during the upgrade process. This error would cause the upgrade to fail and could remove many important system files.

It is safe to perform this procedure even if the DCM has been updated recently. It will not damage any system files.

1. Download the file ipkg-fix.tar onto the DCM. You could do this with any one of the following commands, run on the DCM terminal:

   # download from Internet site
   wget http://www.guralp.com/download/DCM/ipkg-fix.tar
   
   # download from your own webserver, where you have saved a copy
   wget http://dcm-mirror.example/ipkg-fix.tar
   
   # copy from your workstation
   scp workstation.example:/home/bob/ipkg-fix.tar .
   
   # send file over x-modem
   rx ipkg-fix.tar
      # (now send file using your terminal emulator)
   
   # send file over z-modem
   rz
      # (now send file using your terminal emulator)

2. Check that the MD5sum of the file is correct, to ensure it has not been corrupted:

   md5sum ipkg-fix.tar
   3fb4f3edc46d5a9efa4812164b357ba6  ipkg-fix.tar
   

3. Extract the file to the root directory:

   tar -C / -x -f ipkg-fix.tar

4. You may now follow any of the standard DCM upgrade procedures.