1. Backup your data including configuration before firmware upgrade is recommended.
2. For UCM61xx on 184.108.40.206 or 220.127.116.11, please upgrade to 18.104.22.168 directly.
3. For UCM61xx on firmware lower than 22.214.171.124, please follow upgrading instructions in UCM61xx release note to upgrade to 126.96.36.199 first, then upgrade to 188.8.131.52.
4. Once upgraded to 184.108.40.206, downgrading to 220.127.116.11 (or lower) is not supported.
Download UCM61xx Firmware Files:
Previous UCM61xx Firmware Files: