[Q] Can't connect to SP704C with ADB

Hello
I've got a Memup 704C, aka Coby Kyros 7048
And I just can't seem to connect via ADB (usb)

this comes with a RK 2918 chipset and Android 4.0.3

I've checked the win7 drivers, and it appears alright. on the system devices...

things I've done so far

re-installed the Android SDK
checked RK drivers
started using ADB.exe 1.0.29, instead of 1.0.25
Of course debugging is enabled, as also "allow mock locations"...

On a previous model, I've used pdanet to make sure it was well connected to my pc, but in this case, the device just doesn't appear anywhere else, besides the control panel... (on the "Devices and Printers")

is there a way to connect via usb to this tablet, in order to use Eclipse to perform some debugging on my application?

I've tried to use another tablet (same brand, model, and specs) but it didn't connected also

Ive also tried to use another pc, but no success. I've got 8 other tablets still in the box, but I don't think a third one will do the «trick»

If I turn on "usb storage" I can access the file system...

I'm going nutts on this one.