For a minute I was wondering what the heck hibernation & temperature had to do with one another.
If you want to know whether the unit is in hibernation or not - just look at the front panel lights - if the D-Link logo/power button is backlit, it's active, if the logo is dim, it's hibernated - get the idea?
Now let's go back to my question - did you reset the unit to default after flashing the firmware?