Source note · Troubleshooting Cisco IP phones stuck upgrading firmware
Cisco lists two causes for endpoints not upgrading after a firmware install: the device pack was not installed on the TFTP server, or the TFTP service was not restarted afterwards.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco Unified Communications Manager
- Subsystem
- device firmware
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 15 and SUs
- Checked
- 2026-10-02
Sources
- Administration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Manage Device Firmware — Cisco Systems · tier 2 current vendor documentation · Potential Issues with Firmware Installs (table)
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting Cisco IP phones stuck upgrading firmware: source note cucm-phone-firmware-upgrade-troubleshooting-issue-no-upgrade. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-phone-firmware-upgrade-troubleshooting-issue-no-upgrade
BibTeX
@misc{warmtransfer-claim-cucm-phone-firmware-upgrade-troubleshooting-issue-no-upgrade,
title = {Troubleshooting Cisco IP phones stuck upgrading firmware: source note cucm-phone-firmware-upgrade-troubleshooting-issue-no-upgrade},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-phone-firmware-upgrade-troubleshooting-issue-no-upgrade},
note = {Source note cucm-phone-firmware-upgrade-troubleshooting-issue-no-upgrade, checked 2026-10-02}
}