Source note · Troubleshooting Cisco IP phones stuck upgrading firmware
For 7800 phones on firmware earlier than 11.5(1), Cisco's two workarounds are to upgrade to 11.5(1) first and then to 12.0(1) or later, or to upgrade directly to 12.0.1ES5 or later.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco IP Phone 7800 Series
- Subsystem
- upgrade path
- Deployment
- on-premises
- Region
- not restricted
- Release range
- source firmware earlier than 11.5(1)
- Checked
- 2026-10-02
Sources
- Cisco IP Phone 7800 Series Release Notes for Firmware Release 12.0(1) — Cisco Systems · tier 2 current vendor documentation · Upgrade from a pre-11.5(1) Firmware Release
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting Cisco IP phones stuck upgrading firmware: source note cucm-phone-firmware-upgrade-troubleshooting-pre115-path. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-phone-firmware-upgrade-troubleshooting-pre115-path
BibTeX
@misc{warmtransfer-claim-cucm-phone-firmware-upgrade-troubleshooting-pre115-path,
title = {Troubleshooting Cisco IP phones stuck upgrading firmware: source note cucm-phone-firmware-upgrade-troubleshooting-pre115-path},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-phone-firmware-upgrade-troubleshooting-pre115-path},
note = {Source note cucm-phone-firmware-upgrade-troubleshooting-pre115-path, checked 2026-10-02}
}