M4250-26G4F-PoE++ - No opening browser nor AV UI - only USB Connection

Zoi wrote:

This switch had 13.0.2.21 Firmware version and AV UI version 1.0.6.6

 

If correct, this version must be extremely old.

 

Interesting enough, on a brief check of the 

M4250-26G4F-PoE++ download center, I can't find such a version at all, so the more I suspect this is a QSC specific firmware.

 

Potentially a factor for having lost the management access (Web, and AV UI:  Had attempted updating to the current NETGEAR or the last Q-Sys supported firmware release probably?

 

There were major changes introduced on the earlier days, look here:

 

https://kb.netgear.com/000065602/M4250-Firmware-Version-13-0-4-13

 

When looking-up Q-Sys FMI, we find that only defined NETGEAR firmware versions are supported with the (proprietary?) Q-Sys configuration files - all relative old, dated from Summer 2025:

 

https://support.qsys.com/en_US/awareness/awareness-%7C-ns-series-gen-2-switch-current-supported-firmware-and-q-sys-config-version 

 

And exactly that latest Q-Sys supported NETGEAR firmware I had referred above introduced  a lot of changes - prohibiting a simple "just update to the current version" approach.

 

Have you heard from Q-Sys Support in the meantime?

 

 

 

The first line for support of QSC switches (manufactured by Netgear) remains with Q-SYS.

 

Log in to the QSC Support Portal using your QSC ID. This will allow you to view your current status and communicate with your assigned support technician as needed.

 

As the NETGEAR Community, we don't know what special configurations like a qscpassword or the like might be in place.

 

FMI:

 

https://kb.netgear.com/23561/How-to-access-the-command-line-interface-CLI-using-the-console-port-of-a-fully-managed-switch 

 

What does output does the serial console port (convenient implemented as a USB Port) give you?