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.

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)

Check that the MD5sum of the file is correct, to ensure it has not been corrupted:
```
md5sum ipkg-fix.tar
cec5f0cb2807650863c05ffc320d185e  ipkg-fix.tar
```
Extract the file to the root directory:
```
tar -C / -x -f ipkg-fix.tar
```
You may now follow any of the standard DCM upgrade procedures.



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