Source note · Troubleshooting Cisco IP phones stuck upgrading firmware
If a newer-VID phone is assigned a default or per-phone load below its hardware minimum, it is likely to reject that load and fail the upgrade, which matches the Load rejected HC symptom.
inferred · Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco IP Phone 8800 Series
- Subsystem
- compatibility
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Status
- inferred
- Checked
- 2026-10-02
Sources
- Cisco IP Phone 8800 Series Compatibility — Cisco Systems · tier 2 current vendor documentation · Hardware versions and minimum firmware
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting Cisco IP phones stuck upgrading firmware: source note cucm-phone-firmware-upgrade-troubleshooting-old-default-hw. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-phone-firmware-upgrade-troubleshooting-old-default-hw
BibTeX
@misc{warmtransfer-claim-cucm-phone-firmware-upgrade-troubleshooting-old-default-hw,
title = {Troubleshooting Cisco IP phones stuck upgrading firmware: source note cucm-phone-firmware-upgrade-troubleshooting-old-default-hw},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-phone-firmware-upgrade-troubleshooting-old-default-hw},
note = {Source note cucm-phone-firmware-upgrade-troubleshooting-old-default-hw, checked 2026-10-02}
}