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Jenni Israelsen

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Aug 2, 2024, 10:24:05 PM8/2/24

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This firmware recovery guide is intended for users who encounter system startup failure due to incomplete or unsuccessful firmware update caused by power outage or network disconnection during the process. To verify if this guide applies to your NAS, follow the steps below:

1. Power off the NAS.
2. Remove all the hard disks.
3. Power on the NAS.
4. Wait for ten seconds and check if you hear a short beep.
5. After the short beep, wait for two minutes to check if you hear a long beep.
6. If you only hear a short beep or do not hear any beep, follow the instructions of this guide to recover your NAS.

Note: To make sure if the data has been delvering to NAS or not, you can login to the console by the username and password, root/root. Then, use the command "ifconfig" to see if the number of TX on eth0 is increasing or not.

NOTE: If the recover progress does not work at the first time, please try another PC and make sure all other network connections are disabled. If the number of TX on eth0 is not increasing, please use another Ethernet cable.

If the BIOS cannot be started or any component cannot be detected correctly, like DRAM, DOM, you need to contact with local distributor and send back the NAS for repair. If the NAS system can be startup correctly after HDD removed, you will need to replace the HDD as the startup failed issue should be caused by HDD.

5. When the screen will show "Uncompressing Linux..." .

At this stage, the system on the DOM is starting to boot up. However, if the system is corrupted, some error message might occur on the screen during the startup process. You can try to recover the system on the DOM by following steps.

6. To recover the system on the DOM, you need follow the step A and step B.

If the BIOS cannot be started, you need to contact with local distributor and send back the NAS for repair. If the NAS system can be started up correctly after removing HDD, you will need to replace the HDD as the startup failed issue is caused by HDD.

5. After the BIOS info, you will see status messages similar to below:

At this stage, the system on the DOM is starting to boot up. However, if the system is corrupted, some error message might occur on the screen during the startup process.
You can try to recover the system on the DOM by following steps.

6. To recover the system on the DOM, you need follow the step A and step B.

14. Please download the latest firmware from the QNAP website and use QNAP Finder to update the firmware to latest version.
(Note: Make sure you have done this step after the system recovery.)

1. Power off the NAS.
2. Uninstall all of the disk drives from the NAS.
3. Connect the USB flash drive to rear USB port of the NAS.

4. Press and hold the USB copy button and then press Power button to power on the NAS.
5. Keep holding the USB copy button till you hear a beep sound and then release it.

6. Once you hear 3 short beeps, it means the firmware recovery is being started. If not, please power off the NAS and redo it with the above steps 4 to 6.
7. After the firmware recovery is done, you will hear a long beep and then NAS will be shut down automatically. (Note: If you hear two long beeps or the NAS is not shutdown after 5 minutes, the firmware recovery might fail. Please redo the process again.)
8. Remove the USB flash drive from the NAS and power on the NAS.
9. The NAS should boot up correctly and can be found by QNAP Finder. (Note: Not completed yet.)
10. Please download the latest firmware from the QNAP website and use QNAP Finder to update the firmware to latest version.(Note: Make sure you have done this step after the system recovery.)

12. Shutdown NAS and plug all HDD(s) back to NAS and power on NAS.
13. Done.

12. Download the latest firmware from the QNAP website and use QNAP QFinder Pro to update the firmware to latest version.(Note: Make sure you have done this step after the system recovery.)

HBShelps you back up data from a QNAP NAS to several local, remote and cloudstorage spaces. Multi-version backup allows you to easily track changes. Whenused with the generally acknowledged 3-2-1 backup strategy, HBS helps yousecure your data to mitigate any risks of data loss.

Withthe overall data size reduced at the source side (your QNAP NAS), requiredbandwidth and backup time is also saved. QuDedup helps in reducing the RPO(Recovery Point Objective) and RTO (Recovery Time Objective) while increasingversions that can be backed up within a certain period of time. When tested ina lab environment with a virtualization solution, QuDedup reduced the backupsize by 75%. HBS data encryption can also be used with QuDedup so you can besure that the data is securely kept.

The revamped HBS 3 features QuDedup technology to deduplicate backup data at the source, greatly reducing the required bandwidth and backup time while improving the efficiency of multi-version backup. Windows, macOS and Ubuntu users can also download the QuDedup Extract Tool to restore deduplicated files (.qdff format) to their normal status and to directly view files. Join the HBS 3 Beta Test now to try out this amazing new feature!

Thanks for your comment. HBS with QuDedup enabled can detect the renamed file, and only the metadata of the renamed file will be transferred.
But please note that QuDedup will only work for files larger than 1 MB. A file smaller than 1 MB will not be deduplicated.
Thank you!

Hi Michael,
thanks for your reply. The 1MB-limit (or even more) is perfectly fine for me. I want to avoid the transfer of large files (1-4 GB) after renaming them. So I will look into QuDedup in more depth.

Hi Bjrn,
You can enable QuDedup in HBS when configuring your backup task. Check out the link below for detailed instructions:
-to/tutorial/article/hybrid-backup-sync
If you need further assistance, feel free to contact our technical support team at Thanks!

Again, I have nowhere found system requirements for QuDedup. Maybe my TS-431P2 with firmware 4.5.1 is not eligible for QuDedup. If that is the case, it would be great if the feature is delivered to my NAS-models with a future firmware update.

Hi Bjrn,
Currently QuDedup is only supported with Intel or AMD powered QNAP NAS models.
This is listed in the HBS intro page ( -backup-sync).
We are working to see if we can extend the support to your TS-431P2. If QuDedup becomes available for more models, the information will be published on our web site.
We appreciate your support and patience. Thank you!

In a nutshell, the installation of Debian on your QNAP TS-41x/TS-42x works likethis: you use the QNAP firmware to write a Debian installer image to flash.When you restart your device, Debian installer starts and allows you tologin via SSH to perform the installation. Debian will be installed todisk and a Debian kernel will be put in flash that will start Debian fromdisk.

If you follow this procedure, Debian 10 (buster) will be installed toyour SATA disk and the QNAP firmware on disk and in flash will be replacedwith Debian. Debian does not install a web interface to configure yourmachine, although it's possible to install such software. If this is notwhat you want, please don't proceed with the installation.

You have to make a backup of all the data stored on your QNAP beforestarting with the installation of Debian since Debian will format the wholedisk during the installation. Also, Debian will replace the QNAP firmwarein flash, so it's also recommended to make a copy of the flash (mtd)partitions. Debian will only modify two flash partitions butit's a good idea to keep a copy of all partitions as you may need them touse the recovery mode. More detailed instructions for making a backup ofyour flash partitions will be given later.