You should see "UFSx Device, Sarasoft" or "USB Serial Converter" listed without any yellow warning triangles.

Before installing the driver, you must temporarily disable Windows Driver Signature Enforcement:

For users encountering authentication errors such as “Authentication stage error: Connection Closed Gracefully” or “BOX_AUTH_ERROR: 9990 HWK: NOT AUTHORISED,” there are several potential causes. These errors often indicate server connectivity issues, expired licenses, or conflicts with third-party software. Activation requires a connection to the SarasSoft server and proper verification of the data in the UFS and HWK memory. Unfortunately, service support for these devices has been diminishing over time, making proper initial verification even more critical.

A red Windows Security warning will appear stating: "Windows cannot verify the publisher of this driver software" . Click . Verifying a Successful Installation

When the UFS Panel cannot connect to SarasSoft servers for verification, you may see messages such as “Support: Bad HID” or “Cannot Access Support”. These errors can result from firewall restrictions, outdated software versions, or server-side issues. Verify that your firewall allows outgoing connections on the ports used by the UFS software, ensure you are running the latest version of the Update Client, and check online forums to confirm that SarasSoft servers are operational.

However, as operating systems move forward to Windows 10 and 11, finding a that works without causing signature enforcement errors has become a challenge. This article provides a comprehensive guide to obtaining, installing, and verifying the SarasSoft drivers to ensure your UFS3 box works seamlessly in 2026. What is the SarasSoft UFS3 Driver?

The UFS3 box acts as a bridge between a PC and a mobile device’s logic board via protocols such as FBUS and USB. To function, the box requires a specific set of drivers to handle:

Comprehensive Guide to Installing Verified UFS3 Sarasoft Drivers on Windows

Go to > Advanced options > Startup Settings and click Restart .

To install legacy UFS3 drivers, you must temporarily instruct Windows to allow unsigned drivers.

The , designed by SarasSoft , remains a classic and powerful tool in the arsenal of mobile technicians for servicing older, legacy mobile devices, particularly Nokia and Samsung.

: Many original UFS3 drivers were compiled strictly for 32-bit (x86) architectures.

: Plug the box directly into a rear motherboard USB 2.0 port, or use an externally powered USB hub. 3. Error Code 39 or Code 52 in Device Manager

allow installation without disabling Windows security features (like Secure Boot). Using a properly signed, verified driver ensures: Stability in Windows Device Manager. No "Device cannot start (Code 10)" errors.