Asus RT-N10 (VER.D1) - Manual (Page 35)

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To launch rescue mode and use the Firmware Restoration
utility:
1. Unplug the wireless router from its power source.
. While holding down the Reset button at the back of the
wireless router, plug the wireless router into a power source.
Release the Reset button when the Power LED at the front
panel begins to flash slowly, which indicates that the wireless
router is in rescue mode.
3. From your computer’s desktop, click
Start > All Programs > ASUS Utility > RT-N10 Wireless
Router > Firmware Restoration.
Firmware Restoration
Firmware Restoration is used on an ASUS wireless router after a
failed firmware upgrade. This utility uploads a firmware file to the
wireless router. The process takes about three to four minutes.
Launch rescue mode before using the Firmware Restoration
utility.