For users with X64 based systems, Terramaster offers a public beta of their TOS 5 operating system that is upgraded in speed and overall user experience.
Below are the details for installing the new BETA. Before starting the test, please be sure to read the following precautions carefully.

Precautions:
1. A beta version is an early version of a program that contains most of the main features, but is not yet complete and may have some defects. This version is only released to a select group of people, or to the general public, for testing and feedback;
2. The Beta version is not suitable for use in work or production environments. If your TNAS device is running business or storing important data, please do not participate in this test;
3. The root file system, storage mount path, application storage location, and startup mode of TOS 5 are different from those of other versions. You will not be able to install TOS 5 through an update, but will need to reinstall the system. Reinstalling the system normally will not delete the data on your hard disk, but for safety, please be sure to back up your data in advance;
4. The Beta version released this time is only applicable to TNAS models in X.86 series (220 series, 221 series, 420 series, 421 series, 422 series);
5. Your current TOS version must be 4.2.09 or higher;
6. TOS 5 Beta requires a new version of TNAS PC (Windows OS: V5.0.12 / macOS: V5.0.12) and TNAS Mobile (Android: V5.0.1 / iOS:V5.0.1).

Download link:
TNAS PC for Windows OS: https://download2.terra-master.com/TerraMaster_TNAS PC_for_win_V5.0.12.zip
TNAS PC for macOS: https://download2.terra-master.com/TerraMaster_TNAS PC_for_mac_V5.0.12.dmg
TNAS Mobile for Android: It will be published later.
TNAS Mobile for iOS: It will be published later.

How to install TOS 5 Beta?
1. Download the TOS 5 Beta installation package: https://download2.terra-master.com/TOS_X642.0_5.0.62_Beta_00077_22032611...
2. Log in to your TOS, go to control Panel > General Settings > Update & Recovery > Restore to Factory Defaults, select "Restore to Factory Defaults" and click "Apply" to clear your original settings;
3. Your TNAS will automatically restart and enter the initialization guide page; If the initialization page is not displayed, please search the NAS IP address by TNAS PC, and enter the IP address in the browser’s address bar to access;
4. Please select "Manual Installation", upload the downloaded TOS 5 Beta installation package, and wait until the installation is complete;
5. The system will automatically restart when TOS 5 Beta is successfully installed. After the system restarts, set the administrator settings as instructed to complete the system installation;
6. After the system is installed, clear the browser cache. Otherwise, some system pages may not be displayed correctly.

Bug reports
As the Beta version is an early version of the program, there may be some defects, please do not pass the bugs of the Beta version to the public to avoid causing unnecessary trouble to others.
If you'd like report a bug, please send the description, reproduction method and screenshot of the bug to the email address: pm@terra-master.com.