ZyXEL Communications ZYWALL USG 1000 Support Notes page 309

If you do see the message, please start the firmware recovery procedure as following steps.
1. Connect a PC with ZyWALL USG's ge1 port via an Ethernet cable.
2. ftp 192.168.1.1 from your FTP client or MS-DOS mode
3.
Set the transfer mode to binary (use "bin" in the Windows command prompt).
4. Reload the firmware. (ex. use command "put 1.00(XL.1)C0.bin" to upload firmware file)
5. Wait the FTP uploading completed and it will restart the ZyWALL USG automatically.
All contents copyright (c) 2007 ZyXEL Communications Corporation.
ZyWALL USG 1000 Support Notes
309