1. Backup your data including configuration before firmware upgrade is recommended.
2. For UCM6xxx on 1.0.15.x, please upgrade to 188.8.131.52 directly.
3. For UCM6xxx on firmware earlier than 1.0.15.x, please upgrade to 184.108.40.206 first, then upgrade to 220.127.116.11. To upgrade to 18.104.22.168, please check 22.214.171.124 release note “Important Upgrading Note” section and follow the instructions.
4. It is recommended to upgrade UCM to latest firmware for product lifespan and security improvements.