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Go to MAINTENANCE > File Manager > Firmware Management and upload the
old firmware to the standby partition.
After the old firmware 4.33(ABFU.1) is uploaded and device reboots, you may get
the error message “Failed to apply startup configuration file and failover to
previous firmware ...” because the configurations between two ZLD versions are
different. The device boots up with previous firmware 4.35(ABFU.2).
Use the commands to manually switch to the firmware partition 4.33(ABFU.1).
Router> configure terminal
Router(config)# set firmware boot number 1
Backup Configuration Apply
1. If the device is downgraded to an older ZLD version, for example, from ZLD
4.35 to 4.33, the hash method for local users on different ZLD versions are
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