ZyXEL U-336E User Manual - Page 131
Kernel Recovery Mode
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Kernel Recovery Mode Your modem is equipped with ZyXEL's exclusive Kernel Recovery Mode. This unique feature enables quick recovery from failed flash uploads. With other modems, a failed flash upload usually results in the user having to return the modem to the factory for repair. In the unlikely event that your modem fails to respond to AT commands after upgrading the flash EPROM: 1. Turn off the modem. 2. Press the D/V button while turning on the modem, then release the button after 5 seconds. A Kernel Program responsible for the update process takes control of the modem. It accepts a limited set of AT commands, including the ATUPX command. 3. Repeat steps 1 through 9 from the previous directions above to upload a file that contains the valid firmware for your modem. Upgrading Your Modem 119
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