ZyXEL Communications ZYWALL USG Series Reference Manual page 350

Chapter 53 File Manager
Enter atuk to initialize the recovery process. If the screen displays "ERROR", enter atur to initialize
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the recovery process.
Note: You only need to use the atuk or atur command if the recovery image is damaged.
Figure 35 atuk Command for Restoring the Recovery Image
Enter Y and wait for the "Starting XMODEM upload" message before activating XMODEM upload on
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your terminal.
Figure 36 Starting Xmodem Upload
This is an example Xmodem configuration upload using HyperTerminal. Click Transfer, then Send
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File to display the following screen.
Figure 37 Example Xmodem Upload
Wait for about three and a half minutes for the Xmodem upload to finish.
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Figure 38 Recovery Image Upload Complete
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Type the firmware file's
location, or click Browse to
search for it.
Choose the 1K Xmodem
protocol.
Then click Send.
ZyWALL / USG (ZLD) CLI Reference Guide