GS1900-48HP completely unresponsive after firmware 2.90 update – No port LEDs, no link

Options
Corazon008
Corazon008 Posts: 3 image  Freshman Member
First Comment
in Switch

Hello,

I have a Zyxel GS1900-48HP switch. After updating the firmware to version 2.90(ABTQ.1)C0, the switch became completely unresponsive:

The Power LED is solid green, but all port LEDs are off.

Fans are running normally.

No Ethernet port shows a link; connecting a PC directly shows "cable disconnected" on the network card.

I tried a long reset (~20 seconds), but the issue persists.

I do not have a physical console port.


Before the firmware update, the switch was working perfectly.

Given that there is no network access and no port LEDs are active, I would like to know:

1. Is there any official Zyxel procedure to recover or reflash the switch in this state?


2. Can this be done even if the switch was purchased second-hand, or is there a limitation?


3. If recovery is possible, what are the exact steps to restore the switch without a console?



Thank you very much for your guidance.

Best regards,

Accepted Solution

All Replies

  • Zyxel_Melen
    Zyxel_Melen Posts: 4,134 image  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate

    Hi @Corazon008

    May I know the status of the SYS LED? If it is blinking, could you help find a 4-pin console to get the booting message? Here is the location of the 4-pin console.

    媒體 (1).jpg

    And here is the info of how to connect the 4-pin console:

    How to use the 4 pin console to connect to Zyxel switch? — Zyxel Community

    Thanks.

    Zyxel Melen


  • Corazon008
    Corazon008 Posts: 3 image  Freshman Member
    First Comment

    Hello, thank you for your prompt reply.

    The SYS LED was turned off only the PWR was on.

    But, hopefully, the switch is working again.

    What I did ? Nothing 😅. After a long time unplugged (a whole night) when I plugged it back in the morning every LED was working and the ports also.

    Have to mention that it's the third time that it "crash" and had to wait a long time. I couldn't find a pattern but previously it happened suddenly and yesterday it was after the update (maybe pure coincidence).

  • Zyxel_Melen
    Zyxel_Melen Posts: 4,134 image  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate
    edited November 18 Answer ✓

    Hi @Corazon008

    According to your update, it seems like this switch encountered an issue related to the PoE. We have other cases where the switch's PoE has a problem, which causes booting to take a long time since the switch is running self-checking.

    You can reference this post to check if this device is still under warranty.

    Zyxel Support Portal [RMA] - Claiming Warranty Service for a Zyxel Product? – Zyxel Support Campus EMEA

    Zyxel Melen


Categories

Switch Help Center

EnglishTiếng ViệtРусскийไทย中文（台灣）