Delete hidden firmware from NVRAM on C2

[Chris7]

One of our C2s still has a test firmware hidden in NVRAM. Because the firmware does not show up in "dir", I cannot delete it from the CLI. There was a KB article detailing the process of going into the Administrator menu at boot-up and choosing a hidden menu option to delete the file directly from the NVRAM. (I've followed it before with great success.) However, I cannot find the article now. I need to provide instructions to my local support to go clear the file out so we can upgrade it. Can someone please refresh me?

[Paul_Poyant]

This is reminiscent of an old A2 issue that required Tier3 intervention via remote session, and an old C2 issue that was automatically resolved by firmware action as of the June 2007 release:
Firmware 5.00.68 release notes state, in the '

code:

Firmware Changes and Enhancements

' section:
"

code:

Automatically delete the manufacturing diagnostic file from flash memory. If present, this file could potentially use enough space that it could prevent configuration files from being saved.

"

Beyond that, we appear to be in unknown (to me, at least) territory here...