Guralp Systems CMG-DCM build <10,000 - Manual (Page 49)

Operator's Guide
4.3 Upgrade Types
There are three different types of upgrade, each of which is described
below. When upgrading via the web interface the desired type is
selected by pressing the appropriate button. When upgrading directly
from the command line or from a USB storage device, the required
type is selected by the use or omission of command-line arguments.
4.3.1 Standard upgrade
The standard upgrade brings the firmware to the latest revision while
respecting and preserving all configuration settings.
To perform a standard upgrade using the web interface, select
“Firmware” from the “Tools” menu. The following screen is displayed:
Press the “upgrade” button and watch the screen for any error
messages.
To perform the same upgrade from the command line, simply enter the
command
eam999 ~ # upgrade
with no arguments, watch the screen for any error messages and then
reboot to complete the process.
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Technical Note: All files on the hard drive are left untouched,
as are any files in the directories /home, /root, /var and
/usr/local. In addition, any file with an extension of
.local will be preserved: this is the mechanism by which most
configuration settings are safeguarded.