M4250 PoE microcontroller bricked after update

[korran]

Earlier today I upgraded from version 13.0.4.9 to 13.0.4.19. After the switch rebooted, the fans all went to 100%, and PoE stopped working.

(M4250-10G2XF-PoE++)#show poe

Controller..................................... BCM591ff
MCU Type....................................... Nuvoton NUC029Z
Firmware Version...............................
PSE Main Operational Status.................... OFF
Total Power Available.......................... 0.0 Watts
Threshold Power................................ 0.0 Watts
Total Power Consumed........................... 0.0 Watts
Usage Threshold................................ 90
Power Management Mode.......................... Dynamic
Traps.......................................... Enable

Looking at the logs, I see the following:

<188> Feb 22 23:26:49 192.168.1.4-1 POE[hwMonTask]: hpc_poe_brcm.c(1278) 944 %% WARN 0/0: PoE uC(06/e1ff) firmware is incompatible/corrupt, requires firmware update.
<188> Feb 22 23:26:39 192.168.1.4-1 POE[hwMonTask]: hpc_poe_brcm.c(1278) 937 %% WARN 0/0: PoE uC(06/e1ff) firmware is incompatible/corrupt, requires firmware update.
<188> Feb 22 23:26:29 192.168.1.4-1 POE[hwMonTask]: hpc_poe_brcm.c(1278) 936 %% WARN 0/0: PoE uC(06/e1ff) firmware is incompatible/corrupt, requires firmware update.
<188> Feb 22 23:26:23 192.168.1.4-1 POE[PoE_Req]: hpc_poe_brcm.c(9704) 934 %% WARN PoE card not present/Initialized for 1/0/8, card Id(0)
<snip similar messages>

I've tried restting to factory settings, which didn't fix the issue. I also tried reverting the main image back to 13.0.4.9, which also didn't fix the issue. How the am I supposed to reinstall a working firmware image on this microcontroller? The documentation doesn't even mention the existence of it. And where can I get this image?

[schumaku]

Reads like a broken PoE uC or a power supply issue. As your device is certainly under warranty coverage, head to https://my.netgear.com/ select your (already registered) switch, and follow the process [Request Hardware Support].

Should they have a specific idea on how to manually update the component, support will certainly come back to you with suggestions. As the fans run on full power, other components might be affected.

[Edit] The uC does also have some PWM outputs and are probably used for the fans, too.

[korran]

> Reads like a broken PoE uC or a power supply issue.

Yes, but likely caused by a design defect in the firmware update process. The system was working flawlessly before I updated it.