Type “atba 5” to change the console baud rate to 115200.

Press any key when you see “Press any key to enter debug mode within 3 seconds.” Please pay attention to the ZyNOS Version, which you will need to check in Step 3. The following is the console recovery procedures for ZyXEL Management Switches.Ĭonnect the switch to your PC with a USB to RS232 cable. In some cases such as downgrading the firmware, the switch might not finish the boot up procedure successfully. If the GS1920 still cannot boot up successfully after resetting, you will need to send the GS1920 to RMA for repairing.įor the GS2210/XGS3700/GS3700/XS3700 Series, refer to the console recovery procedures below to recover the switch.

Please reset the switch to its factory default. If the switch cannot boot up after the firmware downgrade, follow the recovery procedures below:įor the XS1920/GS1920 Series, there is no console port for recovery. Downgrade the firmware from V4.30(AAxx.0)C0 to V4.10(AAxx.5)C0 or V4.20(AAxx.1)C0.įor the GS1920/GS2210 Series, downgrading the firmware from V4.30(AAxx.0)C0 to V4.10 (AAxx.5)C0 and save the configurations. Continue downgrading to a previous version if necessary.įor the X/GS3700 Series, you need to downgrade the firmware from V4.30(AAxx.0)C0 to V4.20(AAxx.1)C0 and save the configurations. Continue downgrading to a previous version if necessary. Therefore, the safest way is to reset the switch to its factory default before downgrading the firmware.

If the firmware is downgraded directly, there might be some configuration lost or other unpredictable behaviors. Reset the switch to the factory default.Īfter the switch has been upgraded to V4.30, user might have implemented new features on the switches, which means the current configuration files might include strings which the previous firmware does not support. If firmware downgrade from V4.30 to V4.10 is necessary, make sure to follow the steps below so that the switch operates normally after rebooting. If the user downgrades the firmware directly, the switch may fail to operate correctly after rebooting.īefore upgrading the device firmware to a newer version, users should back up the configurations. The CLI command strings may have been changed. Rom block allocation has also been changed.Ģ. A new firmware usually has new features or enhances the main features. Can a switch’s firmware be downgraded from V4.30 to V4.10? Answerįor ZyXEL enterprise switches, firmware downgrade is not supported and it is not recommended to do so.

Zyxel firmware bin or rom