User manual

Appendix D – Recovering From a Failed Upgrade
293
(Re)start the BOOTP server.
Attach the 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 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 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 SG unit and perform a flash upgrade as per usual to
reprogram its flash.
Note
If the 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.