Factory Reset of GS1920-48 results in GS1900-HP firmware load.

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Casey
Casey Posts: 10
Friend Collector First Comment
edited March 2023 in Switch

While working with a finicky cMP Link Aggregation problem I noticed some ports were dropping. A restart didn't fix the problem, so I did a factory reset using the side button.

After the reset I navigated to 192.168.1.1 and LO! I now have downgraded my CS1920-48 to a GS1900-HP.

This I have rebooted and reset a number of times, and have tried to upload the last most recent firmware for the 1920. No go; it's stubbornly sticking to the GS1900-HP web ui.

How do I proceed to recover from this?

edit: FWIW I can no longer access this webUI via firefox as this firmware is using really old encryption standards.

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  • Casey
    Casey Posts: 10
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    edited March 2023
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    The serial number on the GS1920's label is SCXXXXXXXBC

    the web ui shows S10XXXXXXX71

    There is no other Zyxel box on this small network

  • Zyxel_Melen
    Zyxel_Melen Posts: 1,639  Zyxel Employee
    First Anniversary 10 Comments Friend Collector First Answer
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    Hi @Casey,

    Could you provide the device photo (front panel and stickers) and the web GUI status page screenshot for me to verify?

    Zyxel Melen

  • Casey
    Casey Posts: 10
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    edited March 2023
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    I'll have to do this in a sequence. first the screen shot.

  • Casey
    Casey Posts: 10
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    next the rack. after this I'll have to unrack this to get to the stickers on the bottom.

    PXL_20230330_162155778.MP.jpg

  • Casey
    Casey Posts: 10
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    PXL_20230330_162212742.jpg

    I've been removing cables; I will have to find a quiet time to unrack this puppy. it's still routing as if it's a 48, but w/out access to the proper management UI

  • Casey
    Casey Posts: 10
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    edited March 2023
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    this won't do, but I was able to squeeze a phone in htere and blind-shoot.

    I'll provide a better one after de-racking

  • JS87
    JS87 Posts: 8
    First Anniversary Friend Collector First Comment
    edited March 2023
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    https://community.zyxel.com/en/discussion/comment/50357#Comment_50357

    Its not SCXXXXXXXBC. It is 5CXXXXXXXBC and matches the MAC-Address range of the switch in your screenshots from the WebGUI.

    The serialnumber is very blurry. It is the label over the MAC-addresses. The beginning matches with your WebGUI screenshot: S14…

    Found your thread on reddit and hope you find answers because thats very interesting!

  • Casey
    Casey Posts: 10
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    thanks @JS87. I find this most curious. since I was wedging my phone between two racked boxes it's no surprise how marginal the photos are. I'm going to re-reack after lunch, putting in a temp switch.

    I may take a movie and upload it somewhere to illustrate that I'm really not kidding about this situation.

    it would be weird if this were base-level fall-back firmware.

  • Casey
    Casey Posts: 10
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    edited March 2023
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    …here we are. I'm going to be able to unrack in about an hour.

  • Casey
    Casey Posts: 10
    Friend Collector First Comment
    edited March 2023
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    and finally, @Zyxel_Melen the sticker on the bottom

    any thoughts?

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