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U-90E Data/Fax Modem
14.2 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
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 1-9 from the previous directions above to upload a file that
contains the valid firmware for your modem.
14-2
AT
commands after upgrading
Upgrading Your Modem
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