Prosafe GS108 v3 is not discovered by the utility

My network is as follows

R1 a router modem Netgear D6200 connected to adsl

SW1 switch  GS608v3 attached to R1

SW2 switch GS108v3  attached to SW1

SW3 switch  GS605v3 attached to SW1

The principal PC is attached to SW2

I have a problem of degrade in the net and so I downloaded the ProSAFE Plus Configuration Utility in order to control the firmware version and the configuration of SW2 (the I will do for the others)

The tool is not discovering any switch on the network

I tried to deactivate the firewall on the PC but it was the same

On the back of the switch there is no MAC and no ping detectes othyer than the router and pc

The monitor of the router shows no devices attached other than the PC

It seems that the switches are completely transparent

The Prosafe Plus was downloaded in the support page for the switch and the new firmware as well, but how can I manege the switch (and perhaps to upgrade the firmware) if it is not recognized by the software?

Furthermore ... I looked for the RESET button as shown on the specs picture .... but in the position (on the right front ) there is a label with AUTO UPLINK

apparently the device is not resettable

thanks for the kind answers