ZyWALL USG 100 Firmware restore via FTP failed！！！

Bob_1 · March 2022

These days I tried to update the firmware via FTP, and then the device cannot be started, I connected the serial port, and the following information is displayed.

I update the firmware according to the prompt FTP connection, and then it keeps saying that it failed, I don't know what to do.

Image: https://us.v-cdn.net/6029482/uploads/editor/yu/ei4ub0fosd8p.jpg

I was writing this question and suddenly realized that I used the firmware of the usg100-plus on the usg100. Well, it seems I can't figure it out.

Image: https://us.v-cdn.net/6029482/uploads/editor/9o/0ezoy42l8bcz.jpg

Zyxel_Cooldia · March 2022

Hi @Bob_1,

Welcome to Zyxel community. In the process of firmware recovery, if you find the error messages "extract_fw_info: Fail = 255" on console, you may check Windows Firewall settings and disable Windows Firewall temporarily on your laptop.

Ref: https://community.zyxel.com/en/discussion/12943/recovery-steps-for-usg-flex-atp-series-application-patrol-signature-issue/p1

ZyWALL USG 100 Firmware restore via FTP failed！！！

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