NAS540 Bootloop, then Upgradekey, now Nothing

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  • Posts: 2,915  Guru Member
    250 Answers 2500 Comments Friend Collector Seventh Anniversary
    Thanks for the walk-through. Do you have a theory how the uImage in flash could be damaged?
  • Posts: 16  Freshman Member
    First Comment Friend Collector
    Mijzelf said:
    Thanks for the walk-through. Do you have a theory how the uImage in flash could be damaged?
    I'm just guessing here since my 'linux' is not too great, but to me it looks as if the uImage was totally healthy. What was off was the checksum for it, which apparently got changed when it executed the upgrade stick. Since it didn't fit with the installed image barebox thought it was corrupt. This led to my pseudo-bricked box. Why my barebox kept rebooting... no clue though.


  • Posts: 2
    First Comment
    edited July 2023

    I used these lines in usb script to solve bootloop. Now nothing, just system led On. Any info?

    ubiattach -m 3 -d 3

    mount -t ubifs ubi3:ubi_config /etc/zyxel

    cd /etc/zyxel

    rm -r *

  • Posts: 2
    First Comment

    I'm in the same situation with a 540.

    I had automatic reboot, I updated to last version and I'm in bootloop.

    I removed disks.

    I reset with back Button, 2 beeps, nothing changed.

    I read about reset deleting the settings folder. I prepared usb key with yours command lines.

    Now the nas stays ON, system led White, but not responding to Nas Seeker, no reset button (no beeps), no power button.

    I can power it off just disconnecting power cord.

    Any tips?

  • Posts: 2,915  Guru Member
    250 Answers 2500 Comments Friend Collector Seventh Anniversary

    I'm afraid that it gets stuck in the bootloader. Without serial connection you can't do anything about that. (And with maybe neither, depending on the actual problem.)

  • Posts: 16  Freshman Member
    First Comment Friend Collector

    Hey there Fefe,

    I think you have to log in via serial to check the screen output, like Mijzelf suggested. I would've never found the solution without that.

    After you did that, you can follow my steps in the answer to this post.

  • Posts: 19  Freshman Member
    First Comment Third Anniversary

    Sorry but I have now the same problem with my NAS542. I downloaded the "NAS540_521AATB3C0_Upgradekey" of Mijzelf, but the led red appears and the device don´t do it, nothing and reboot again.
    When you tall about "serial connection" what do you meant? I´m very lost with the solution.

  • Posts: 2,915  Guru Member
    250 Answers 2500 Comments Friend Collector Seventh Anniversary

    Here is a wiki about (using) the serial port on a router: https://openwrt.org/docs/techref/hardware/port.serial

    For a NAS it's basically the same. Just another embedded Linux box.

  • Posts: 19  Freshman Member
    First Comment Third Anniversary

    I've never done anything like this. Let's see what I can learn from the link you sent me. Thank you so much.
    Although I don't know if I'm going to be able to do anything with a device that reboots every few seconds. At Zyxel they don't give me the chance to send the equipment in for repair. They say that it is an EOL and that I have to buy a new one.

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