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Welcome!- What Hardware version is your router? Look at sticker under the router case.
- Link>What Firmware version is currently loaded? Found on the routers web page under status.
- What region are you located?
The router doesn't store any historical data as far as user sites and where they have been to. It does store diagnostic data and I think router accessed by the admin or user account. However if the router was factory reset or you can't gain access to the routers web page using the Admin log in account, the logs would be deleted on a factory reset and if you would have to factory reset the router again to gain access if the Admin or User PW have been set up and you don't know what they are. If you can gain access to the routers web page you can see the UP time it's been online. If the time is short or with in a day, then you'll know someones been messing with the router if there hasn't been any power outages.
I recommend that you phone contact your regional D-Link support office and ask for level 2 or higher support to see if there is any other way to gain access. I presume there may not be.
I recommend that when you get to the point where you can configure the router for your needs, I would place the router in a locked room where no body can gain access to the router. This will help someone doing a factory reset with the button.
Set up the routers Admin account with a PW and don't give it out. Disable the User account or set up a PW for it and don't give it out.