Copied this from the os6 manual.  Won't help till you can get to UI I guess.  But let's you know why it is acting that way.
Miscellaneous
Reset Button To allow use of the reset button, check the box. To prevent an accidental reset to default settings, uncheck the box (this also disables the remote POE reset functionality).
Note: You can reset the device to default settings through System > Reset to Factory Defaults.