I would try FAQ 3 of 5 to get the unit to boot up to the point were you can flash the firmware on it. Also this is the proper reset process if you want to follow it.
Please switch the unit to off and wait until the lights are off.
Hold the function button for 10 seconds while it is still off.
While still holding the function button after 10 seconds please flip the switch to off.
Once the function light begins to blink release the function button and press it again for one second.
Wait until the power light is solid and this will restore your unit.
This process will not delete any data and will only restore the admin password and set the IP address back to DHCP.