Firmware Downgrade Zyxel FWA505 Question

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MarcoFer
MarcoFer Posts: 2 image  Freshman Member

Hello everyone, since updating to the latest firmware (1.71) on my Zyxel FWA505, I have been experiencing frequent disconnections and noticeably reduced stability.

I would like to downgrade to version 1.60, which I believe to be more stable, but whenever I upload the file I receive the error "Image uploading failed, The selected file is an illegal image." (see attached screenshot). Is there a procedure or workaround to perform the downgrade? Thank you in advance for your support.

Screenshot 2026-10-20 142656.png

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  • Zyxel_Melen
    Zyxel_Melen Posts: 5,174
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate
    image  Zyxel Employee
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    Hi @MarcoFer

    Please help to upload the .bin file to upgrade. I tried downgrade from 1.71 to 1.60 P3 with success.

    Zyxel Melen