Upgrading CMG-DCM firmware from removable disk

If your DCM does not have access to the Internet, you can update its software from a connected USB disk. Below are instructions for preparing the disk and for using it to upgrade the DCM.

Remove the DCM hard disk, and attach it to a PC using a FireWire cable, or a USB link and supplementary power supply.
You will now need to get a copy of the DCM feed web directory. You can either request this from Guralp Systems on CD, or you can download it.
To download under Linux or any other unix-like system, use the wget utility:
```
cd /path/where/removable/disk/is/mounted
wget -np -nH -m http://www.guralp.net/cmgdcm/feeds/
```
If you have previously used this command to download packages into a directory, issuing it again in the same directory will only download files which have changed.
Instructions for Windows:
1. You can download a special version of wget here (author's page here). This also has a script, MIRROR.BAT, which will execute the above-mentioned command line.
2. Make sure that you can see the removable drive on the computer. For this example, we assume it is drive E:, but it could be anywhere.
3. Extract the .zip file you just downloaded into (for example) E:\
4. Run the MIRROR.BAT file by double-clicking on it.
5. Wait for the process to complete.
Now place the specially-prepared disk into the DCM.
With a recent firmware version, you can simply navigate to Configuration → Software on the web interface, and click on the Upgrade from Disk button. This will complete your upgrade procedure.
If you do not have such a page, then log in to the DCM as root (either through the serial port — Data Out is by default configured to be a terminal at 115200 baud — or through ssh).
Once logged in, type:
```
upgrade gfat32
```
Reboot the DCM.



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