CyberGuard SG300 User Manual page 288

(Re)start the BOOTP server.
Attach the CyberGuard SG unit's LAN port or switch directly to your PC using a crossover
cable.
Note
If you are using an older LITE(2)/LITE(2)+, you may have to attach the unit's WAN port
directly to your PC using a crossover cable for the first stage of the recovery procedure
Accordingly, your BOOTP server requires an entry specifying the CyberGuard SG unit's
WAN port MAC address.
Hold in the Reset/Erase button while applying power, keep it held in for 3 seconds.
After 20 – 30 seconds, the CyberGuard SG unit loads the file from the DHCP/BOOTP
server and the Heart Beat/H/B light begins flashing.
Browse or telnet/ssh to your CyberGuard SG unit and perform a flash upgrade as per
usual to reprogram its flash.
Note
If the CyberGuard SG unit is uncontactable, but the Heart Beat/H/B light is flashing, it
may be due to bad configuration. If this is the case, hit the Reset/Erase button twice
within 2 seconds to restore factory default configuration, and perform the network boot
again.
284
Appendix D – Recovering From a Failed Upgrade