# Download image to controller via TFTP/FTP transfer download datatype code transfer download mode tftp transfer download serverip <tftp-server-ip> transfer download path / transfer download filename AIR-CT5500-K9-8-3-150-0.aes transfer download start
Do not use "Clear Install." Version 8.3.150.0 requires configuration migration. Always use the save config command followed by orderly reboot.
: Moving to or from this version often requires checking specific interim steps. For example, some users downgrade to 8.3.150.0 for stability if newer releases like 8.5.x encounter bugs on older hardware.
No fixes were back-ported to 8.3.150.0 because the train is obsolete.
High Availability (HA): Robust stateful switchover capabilities to ensure minimal downtime during a controller failure.