Follow these steps below to upgrade/downgrade the firmware of your NAS.

1. Find the model name and firmware version of your device by this method.

2. Go to Download Center 

3. Select NAS/Expansion as Product Type, find which type of your NAS, Model then choose Operating System to download the desired Firmware Version you want to upgrade/downgrade. 

3. Click on the Remarks button to read the release notes for the selected firmware version as they may contain specific instructions

4. The downloaded file is a zipped file, please extract image file from it.

5. Open Qfinder and select your NAS first then find Tools Update Firmware.

6.Input admin and Password of admin.

7. Select Path of system firmware image file and Browse the img file on your PC/Mac.

8. If the selected firmware version is older than the current firmware version, following prompt will pop.Please read them and check I have read the above and understand the risks of downgrading firmware if you want to proceed, click OK.

9. Wait for firmware upgrading process finished.