Is this with your NVX?
Have you tried changing ethernet cables to a known working Cat5e or newer one?
Does a direct-connection (http://sphardy.com/web/directconnect
) between your MacBook Pro and the NAS work fine?
Does your older MBP still work fine with the NAS?
As for installing the beta firmware, if the download of the firmware update is incomplete it will fail the verification check. The 4.2.20-T7 firmware image file is 60893184 bytes in size.