User guide
SerVision MVG 400 System Guide
Upgrading the Firmware 169
In some cases, a download fails and it is not possible to access the unit afterwards in the usual
way. This can occur, for example, if the download was interrupted before it was completed, if
there is a problem with the flash memory of the unit, or if an incompatible firmware version
was downloaded to the unit.
When this happens, you can usually reinstall the firmware using the Catch Boot option. This
option uses the unit’s built-in boot loader for downloading, and does not need the firmware in
order to function.
NOTE: The catch-boot option uses an RS232 cable for download, and is much slower than
LAN download.
NOTE: The Catch Boot option does not normally change any of the unit’s settings.
Nevertheless, it may sometimes cause the system settings to be lost.
D
D
D
To see whether it is possible – or necessary – to reinstall firmware using
Catch Boot:
• Unplug the unit and then plug it back in. The power LED indicates whether Catch Boot
is necessary and possible, as follows:
LED Behavior Description
Flashes orange once when power is
restored and then remains a solid color
Catch Boot can and should be performed.
Flashes orange/green every second Catch Boot is not necessary, because the
unit has a valid software version.
Remains solid green and does not flash
orange
Catch boot cannot be performed.
Alternates between flashing quickly for a
half second and remaining solid for a half
second
There is a major error in the system.
Contact technical support or your vendor.
Do not perform Catch Boot.
D
D
D
To reinstall firmware using the Catch Boot option:
1. Connect the MVG 400 to your computer with an RS232 connection cable.
Note: If you do not have an RS232 cable, please consult your vendor.
Note: If a PTZ controller is connected to the RS232 port, disconnect it first.
Note: You must have an RS232 connector on your PC in order to use the catch-boot
option. If one does not exist, it is possible to purchase a USB-to-serial device, and
connect the RS232 cable through it. Such devices are available in most computer stores.
2. Run the TVG
_download.exe utility with the –t parameter.