SCSI2SD Issue : can't acces drives from my K2000R

Hello, 
I own a K2000R V3.87 and recently bought a SCSI2SD drive on ebay. I bought it in fact for this synth and an Ensoniq TS10. The guy who sold me the device formatted the SD card in order to get drives 0 to 7 shared between both synth. The K2000R has specific drives and that's the same for the TS10. When using the device with the Ensoniq it works like a charm. But when using it with the K2000R, it detects the drive but when trying to show the content of the drive, it shows a "pc_dskinit this is not a DOS disk". On the other hand, it can show the content of the drives created for the Ensoniq TS10 and can succeed in accessing to the content.
I had a great, really great support from the guy who sold me the device (synthplus on ebay, I really recommand). He sold a lot of these devices "prepared" for K2000 but never encountered this kind of issue. We tried formatting the Card again from the K2000 (seems to work at first but then when trying to access the same error message appears) we tried another SD card (didn"t work) and when sending back to him the SD card he sold me with sounds, he could access to the files on his K2000. So apparently there are issues neither on the SCSI2SD nor on the SD card.
Well we checked almost everything including powering or not the device, disconnecting other SCSI devices and so on.I have to notice that I made a diagnostic then and it appears that I have some issues inside the K2000 with pseudo and godot chips. I don't know if it's related but this is the only "visible" issue in my K2000.

I wanted to know if some of you got this kind of issue with their K2000?
Thanks for reading me and have a nice day
Nicolas from France.