flash masta not seen by any pc

[funkey]

I bought used flash masta. Games that previous owner loaded works properly.
When i connect it to computer - the red lights works, but zadig doesnt see the cart.

I checked it on 2 pc's and 1 mac; 6 different usb cables and all usb ports.

[Flavor]

Hey funkey! I'm sorry that it took a while to respond here.

On the PCs, do you hear any sort of sound from the OS when you plug it in (like that it's recognizing a USB connection)?

On the Mac, when it's plugged in, can you try to paste the output from one of these command-line (Terminal) commands?

ioreg -p IOUSB -l -w 0
system_profiler SPUSBDataType
lsusb

Those should print out what USB devices are connected.

Is this a Neo Geo Pocket cartridge or a WonderSwan cart?