D-Link DI-707P - Manual (Page 70)

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After you have tried other methods for troubleshooting your network, you
may choose to Reset the DI-707P to the factory default settings.
To hard-reset the D-Link DI-707P to the Factory Default Settings, please do
the following:
Resetting the DI-707P to the Factory Default Settings
Use a paper clip to press the Reset button and
power on.
Locate the Reset button on the back of the DI-707P
Turn off the DI-707P
After you have completed the above steps, the DI-707P
will be reset to the factory default settings
Hold for about 5 seconds (don’t hold too long) and
then release. (Or, release when M1 and M2 flash
at the same time.)