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1. If user did not backup the configuration file before firmware upgrade, please follow the
procedures below:
Use Browser to login into device as administrator.
Click Maintenance > File Manager > Configuration File to open the Configuration File
screen. Use the Configuration File screen to backup current configuration file.
Find firmware at www.zyxel.com in a file that (usually) uses the system model name with
the .bin extension, for example, “223UJC0C0.bin”.
Click Maintenance > File Manager > Firmware Package to open the Firmware Package
screen. Browser to the location of firmware package and then click Upload. The device
automatically reboots after a successful upload.
After several minutes, the system is successfully upgraded to newest version.
The following is the firmware downgrade procedure:
1. If user has already backup the configuration file before firmware upgrade, please follow the
procedures below:
Use Console/Telnet /SSH to login into device.
Router>enable
Router#configure terminal
Router(config)#setenv-startup stop-on-error off
Router(config)#write
Load the older firmware to device using standard firmware upload procedure.
After system uploads and boot-up successfully, login into device via GUI.
Go to GUI “File Manager” menu, select the backup configuration filename, for example,
statup-config-backup.conf and press “Apply” button.
After several minutes, the system is successfully downgraded to older version.
2. If user did not backup the configuration file before firmware upgrade, please follow the
procedures below:
1. Use Console/Telnet /SSH to login into device.
2. Router>enable
3. Router#configure terminal
4. Router(config)#setenv-startup stop-on-error off
5. Router(config)#write
6. Load the older firmware to device using standard firmware upload procedure.
7. After system upload and boot-up successfully, login into device via
Console/Telnet/SSH.
8. Router>enable
9. Router#write
Now the system is successfully downgraded to older version.
Note: device might lose some configuration settings during this downgrade procedure. It is caused
by configuration conflict between older and newer firmware version. If this situation happens, user
needs to configure these settings again.
Appendix 2 - SNMPv2c/3 private MIBS support
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