Failed Update, Now Nas isn't booting

English Firmware
1

Hi there.

Owner of a TS-873. S/N Q18xxxxxx

I woke up this morning to a failed NAS update. Now it doesn’t boot anymore.
Fans are spinning, and so are disks, but it stays invisible. QFinder can’t find it either:
I received update notifications via email during the night:

[Error][Firmware Update] Notification from your device: Foundation

NAS Name: Foundation
Severity: Error
Date/Time: 2025/11/19 00:27:01

App Name: Firmware Update
Category: Firmware Update
Message: [Firmware Update] Failed to update system firmware from version 5.2.7.3256 to 5.2.7.3297 due to the size of the update file. Please contact technical support for assistance. Error code: FW012

Then immediately after:

[Error][Firmware Update] Notification from your device: Foundation

NAS Name: Foundation
Severity: Error
Date/Time: 2025/11/19 00:27:02

App Name: Firmware Update
Category: Firmware Update
Message: [Firmware Update] Failed to update system. Error code: FW999

I looked up online and my model has no way to connect an external screen, some docs seem to say there’s no firmware recovery available… I also tried resetting using the hardware button, didn’t work.

How can I fix this ?

CleanShot 2025-11-19 at 21.16.07@2x
CleanShot 2025-11-19 at 21.16.07@2x3521×1221 298 KB

2

I hope you have backups… also make sure in the future to never enable auto updates.

Does the NAS boot without disks (all disks ejected) into web setup ?

4

Based on the error message, we suspect this is a firmware update failure that has led to abnormal DOM access.

Please try the following steps:

  1. Remove all hard drives and reboot the device to see if it can boot up normally.

  2. If it boots successfully, shut it down, reinsert the hard drives, and then reboot again.

If the steps above do not resolve the issue, or if the device fails to boot successfully in the first step, please open a support ticket for us. Our Support Team will step in to assist you. Thanks!

5

–Translation added by Dolbyman–

Hello,

With a graphics card installed, firmware recovery is possible using the instructions in the attachment → PDF upload not allowed. Please open a support ticket.

Regards

Hallo,

With a graphics card inserted, there is the possibility of firmware recovery using the instructions in the attachment → PDF upload not allowed. Please open a support ticket.

Best regards