Dell Networking X1052 - USB console doesn't work after upgrade to 3.0.0.91/1.0.0.25

Hi, 

seems USB console doesn't work after FW upgrade from version 3.0.0.82 to 3.0.0.91 on Dell X1052.

I'm using Linux machine and serial/usb device doesn't show up (it was working before the upgrade process).

SW version 3.0.0.91 ( date 23-Apr-2017 time 09:45:17 )
Boot version 1.0.0.25 ( date 05-Apr-2017 time 09:55:19 )
HW version 00.00.04

So, what should I do ?

Thanks, 

Best regards