netscreen downgrade

Netscreen OS Downgrade CLI

1. Connect your computer to the NetScreen device:
?? a. Using a serial cable, connect the serial port on your computer to the console port on the NetScreen device. This enables you to manage the NetScreen device.
? ?b. Using an Ethernet cable, connect the network port on your computer to port 1 or to the management port on the NetScreen device. This enables the transfer of data between the computer and the TFTP server and the NetScreen device.

2. Make sure that you have a ScreenOS 4.0.X image file stored in the TFTP server directory on your computer.

3. Run the TFTP server on your computer by double-clicking on the TFTP server application. You can minimize its window but it must be open to run in the background.

4. Log in to the NetScreen device using a terminal emulator such as HyperTerminal. Log in as the root admin or an admin with read-write privileges.

5. Issue the exec downgrade CLI command.

6. Answer Yes to this question: “Are you sure you want to downgrade the loader and the file system? ([y]/n)”

7. Answer Yes to this question: “Do you want to continue the downgrade operation? ([y]/n)”
?? Wait a few moments while the NetScreen device executes the downgrade operation.
?? When the downgrade is complete, the device restarts automatically.

8. While the device is restarting, keep your eyes on the screen and when you see “Hit any key to run loader”, press any key on your computer keyboard to interrupt the startup.

9. At the Boot File Name prompt, enter the file name of the ScreenOS firmware you want to install.

10. At the Self IP Address prompt, enter an IP address that is on the same subnet as the TFTP server.

11. At the TFTP IP Address prompt, enter the IP address of the TFTP server. An indication that the firmware is loading successfully is the display of a series of “rtatatatatatata...” running on the terminal emulator screen and a series of symbols running on the TFTP server window. When the firmware installation is complete, a message informs you of the success of the installation.

12. Answer Yes to this question: “Program to on-board flash? ([y]/n)”
?????Answering yes saves the firmware you installed to flash memory.

13. Answer Yes to this question: “Run downloaded image file? ([y]/n)”
???? Answering yes instructs the NetScreen device to start running the new firmware.

14. Because there is no configuration on the device, you must configure the Trust interface to be able to manage it and then load a configuration file.
????a. set interface interf_name zone trust
??? b. set interface interf_name ip ip_addr

15. Load a configuration file that is compatible with ScreenOS 4.0.X using the save soft from tftp ip_addr filename to flash CLI command. You have to load a configuration file that was saved with ScreenOS 4.0.X firmware because ScreenOS 4.0.X firmware does not support configuration files saved with ScreenOS 5.0.0 firmware.