Source note · Troubleshooting Cisco IP phones stuck upgrading firmware
A Cisco IP Phone 7800 may have trouble booting when upgraded directly from a release earlier than 11.5(1) to firmware 12.0(1).
Checked 2026-10-02
Your Cisco IP Phone 7800 Series phone may have trouble booting up if you are upgrading from a pre-11.5(1) release to 12.0(1) firmware.
- 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); target 12.0(1) or later
- 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-boot. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-phone-firmware-upgrade-troubleshooting-pre115-boot
BibTeX
@misc{warmtransfer-claim-cucm-phone-firmware-upgrade-troubleshooting-pre115-boot,
title = {Troubleshooting Cisco IP phones stuck upgrading firmware: source note cucm-phone-firmware-upgrade-troubleshooting-pre115-boot},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-phone-firmware-upgrade-troubleshooting-pre115-boot},
note = {Source note cucm-phone-firmware-upgrade-troubleshooting-pre115-boot, checked 2026-10-02}
}