It seams a new firmware was issued on the cisco download site on january 11 :
I have succesfully downloaded this file, but each time I try to unzip it, I get an error.
I have tried to download it several times, using different navigator and different pcs or macs and using the donwload manager or without it, and I get the same result.
Also the md5sum of the downloaded file is the one indicated on the download screen :
Cisco ESW 540 24-Port 10/100/1000 PoE Switch-
Image name: ESW_540_K9_2.1.16.zip
So the conclusion is that this archive is corrupted.
As this product is for the SMB market, I am unable to open a case on the Cisco site to ask for a working version.
Who is responsible for this and how to get a good version ?