When the system has a booting problem, a device error occurs, or the system has a problem, the POWER/SYS light on the front panel is solid amber. Follow these steps to start up the Rescue mode directly and then recover the system.
1. Press and hold the RESET button on the back panel of the security appliance for more than 3 seconds and power the unit on simultaneously.
The Rescue mode starts up. The Status LED flashes green and then shines solid amber. In Rescue mode, the security appliance works as a TFTP server.
2. Remove all cables from the WAN and LAN ports.
3. Connect your PC to the LAN port.
4. Configure your PC with a static IP address of 192.168.75.100 and a subnet mask of 255.255.255.0.
5. On your PC, start your TFTP client, such as tftpd32. Specify the host IP address as 192.168.75.1 and transfer the ISA500 firmware file from your PC to the security appliance.
The security appliance will upgrade the firmware after you upload the image. This process should take several minutes including the reboot process.
IMPORTANT: During firmware upgrade, do not turn off the device, shut down the PC, interrupt the process, or remove the cable in any way until the operation is complete.
When the POWER/SYS light on the front panel is solid green, the system is operating normally.