Field Notice: FN72278 - Some C9120 and C9115 APs Stuck in Bootup with 'Uncorrectable ECC Error' Displayed - BIOS/Firmware Upgrade Recommended

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Updated:October 4, 2023
Document ID:FN72278

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Notice

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Products Affected


Affected Product Name Description Comments
C9115AXI-A Cisco Catalyst 9115AX Series  
C9115AXI-B Cisco Catalyst 9115AX Series  
C9115AXI-B-EDU Cisco Catalyst 9115AX Series  
C9115AXI-B1 Cisco Catalyst 9115AX Series  
C9120AXE-E C9120AX External 802.11ax 4x4:4 MIMO;IOT;BT5;mGig;USB;RHL  
C9120AXI-A C9120AX Internal 802.11ax 4x4:4 MIMO;IOT;BT5;mGig;USB;RHL  
C9120AXI-B C9120AX Internal 802.11ax 4x4:4 MIMO;IOT;BT5;mGig;USB;RHL  
C9120AXI-B-EDU Cisco Catalyst 9120AX Series - EDU  
C9120AXI-C C9120AX Internal 802.11ax 4x4:4 MIMO;IOT;BT5;mGig;USB;RHL  
C9120AXI-D C9120AX Internal 802.11ax 4x4:4 MIMO;IOT;BT5;mGig;USB;RHL  
C9120AXI-E C9120AX Internal 802.11ax 4x4:4 MIMO;IOT;BT5;mGig;USB;RHL  
C9120AXI-EWC-S Cisco Embedded Wireless Controller on C9120AX Access Point  
C9120AXI-F C9120AX Internal 802.11ax 4x4:4 MIMO;IOT;BT5;mGig;USB;RHL  
C9120AXI-G C9120AX Internal 802.11ax 4x4:4 MIMO;IOT;BT5;mGig;USB;RHL  
C9120AXI-H C9120AX Internal 802.11ax 4x4:4 MIMO;IOT;BT5;mGig;USB;RHL  
C9120AXI-I C9120AX Internal 802.11ax 4x4:4 MIMO;IOT;BT5;mGig;USB;RHL  
C9120AXI-K C9120AX Internal 802.11ax 4x4:4 MIMO;IOT;BT5;mGig;USB;RHL  
C9120AXI-Q C9120AX Internal 802.11ax 4x4:4 MIMO;IOT;BT5;mGig;USB;RHL  
C9120AXI-R C9120AX Internal 802.11ax 4x4:4 MIMO;IOT;BT5;mGig;USB;RHL  
C9120AXI-S C9120AX Internal 802.11ax 4x4:4 MIMO;IOT;BT5;mGig;USB;RHL  
C9120AXI-T C9120AX Internal 802.11ax 4x4:4 MIMO;IOT;BT5;mGig;USB;RHL  
C9120AXI-Z C9120AX Internal 802.11ax 4x4:4 MIMO;IOT;BT5;mGig;USB;RHL  




Defect Information


Defect IDHeadline
CSCwa12652"Uncorrectable ECC Error" displayed at bootup. Access Point might be stuck in boot-up

Problem Description


When powered on, certain C9120 and C9115 access points (APs) manufactured in a specific serial number range will get stuck in a continuous reboot loop with the “Uncorrectable ECC Error” displayed repeatedly.


Background


Units built between 2021-10-20 and 2021-10-27 were loaded incorrectly in the factory, which created a potential corruption in the load image.


Problem Symptom


An affected unit continuously reboots after it is powered on.

Additionally, this “Uncorrectable ECC Error” message will be seen, multiple times, when connected via the AP console port during the bootup sequence.

[01/01/1970 00:00:17.9160] bcm63xx_nand xxxxxxxx.nand: uncorrectable error at 0x4d83000

Workaround/Solution


In order to repair affected units, complete these steps:

  1. Download the special image bundle-axel-SS-8_10_130_0.img.
  2. Put the image on a TFTP server.
  3. Access the affected AP from the console port.
  4. Get into u-boot mode.
  5. Use u-boot commands in order to rewrite the image.

For more details, see Repairing C9120/C9115 Access Points from u-boot.


How to Identify Affected Products


Affected units can be identified by the serial number (SN). See the Serial Number Validation section for information on how to identify affected units.

An example of where the SN is located on the C9120 and C9115 APs is shown in these images:

 


Serial Number Validation


Cisco provides a tool to verify whether a device is impacted by this issue. To check the device, enter the serial number in the Serial Number Validation Tool.

Important: For security reasons, you must click the Serial Number Validation Tool link that is provided in this section. Do not copy and paste the link into a browser. Use of the Serial Number Validation Tool URL external to this field notice will fail.

Revision History


VersionDescriptionSectionDate
1.2Updated the Products Affected, Problem Description, and Problem Symptom Sections—2021-DEC-09
1.1Updated the Workaround/Solution Section—2021-NOV-09
1.0Initial Release—2021-NOV-08

For More Information

For further assistance or for more information about this field notice, contact the Cisco Technical Assistance Center (TAC) using one of the following methods:

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