Firmware DS-7608NI-E2/8P/A and system date

Hello,
I would like to find out what is the current firmware version for the DS-7608NI-E2/8P/A and since when it is officially available.
Don't you know why the system date is set to 01.01.2004 every time I connect the NVR to the PC?
Is it possible to find out from the log files whether the date and time were intentionally changed?
thank you for the answers