ASUS DSL-AC55U 用户手册

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Firmware Restoration is used on an ASUS Wireless xDSL Modem 

Router that failed during its firmware upgrading process. It 

uploads the firmware that you specify. The process takes about 

three to four minutes.

IMPORTANT:  Launch the rescue mode on the router before using the 

Firmware Restoration utility.

NOTE:  This feature is not supported on MAC OS.

utility:
1.  Unplug the xDSL modem router from the power source.
2.  Hold the Reset button at the rear panel and simultaneously 

replug the xDSL modem router into the power source. Release 

the Reset button when the Power LED at the front panel 

flashes slowly, which indicates that the xDSL modem router is 

in the rescue mode.