Admin password reset

paolopic
paolopic Posts: 2 image  Freshman Member
in Security

Is there a procedure to reset the admin password for my USG-20 Firmware 4.73?

I already tried tit atgk -u but it seems doesn't work.

Any help is appreciated.

All Replies

  • smb_corp_user
    smb_corp_user Posts: 171 image  Master Member
    5 Answers First Comment Friend Collector Third Anniversary

    Are you sure that you have got the correct firmware version? From what I can find, it seems that USG-20 should use firmware version

    • 5.41(ABAQ.0)C0 (10/19/2025) or
    • 5.40(ABAQ.0)C0 (05/16/2025) or
    • 5.39(ABAQ.1)C0 (11/17/2024)

    https://www.zyxel.com/us/en-us/support/download?model=usg20-vpn

  • Zyxel_Melen
    Zyxel_Melen Posts: 4,035 image  Guru Member
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate

    Hi @paolopic

    If your device is ZyWall USG 20, please press the reset button for 5 seconds to reset to default.

    image.png

    If your device is USG 20-vpn, please press the reset button for 10 seconds to reset to default.

    Zyxel Melen


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