PMP450 Upgrade Recommended

Document Number FSB9081
Revision 000v001
Download the PDF version Application Global
Effective Date August 24, 2020
Expiry Date N/A
  Warranty Service   High – Perform immediately
X Informational X Medium – Perform at next scheduled maintenance
  Customer Specific   Low – Perform when system exhibits symptoms

Download the PDF version

SUBJECT: PMP450 Subscriber Modules Lose Factory Calibration Data.

MODEL / SYSTEM AFFECTED: All PMP450 Subscriber Modules running firmware
versions older than


Customers are reporting a symptom on the PMP450 subscribers GUI -> Home -> General Status – “Radio not calibrated” and the SM stops operating.

In all cases, the “Radio not calibrated” symptoms occurred on SMs being managed by cnMaestro and running firmware versions older than These units are susceptible to factory calibration data being corrupted due to repeated configuration pushes from cnMaestro.

CURRENT STATUS OF INVESTIGATION: The problem has been determined to be caused by a software defect and it has been corrected in the official PMP450x software release of or later.

RESOLUTION: If you have PMP450 SM running software older than, they should be upgraded to or beyond to avoid this failure.

Upgrade path: 13.4.1 -> 14.1.1 -> 15.1.x -> 15.2.1 -> or 16.2.x(latest software release at time of FSB issue is16.2.2) If you have a PMP450 device that is exhibiting the “Radio not calibrated” message, please open a support ticket with Cambium Technical Support to RMA the unit.

If you encounter an issue please open a support ticket with the Cambium Support team at the following URL:

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