“Cannot start Samsung DeX” on Screen Mirroring Mode appears after Connecting S8 with DeX?

Last Update Date : Apr 23. 2018





Sorry for your inconvenience.


At that time please check whether your S8/S8+ is the device configured by *KCC (Knox Customization Configurator).


We have been notified that Samsung DeX feature may not work properly on limited S8/S8+ devices configured by KCC due to some restriction functions of KCC.


* KCC (Knox Custom Configuration): a cloud-based service(solution) that configures bulk devices’ setting for B2B customer’s business needs



To check this, on Apps screen


1. Tap Settings


2. Tap About phone and tap Software information. Then, check if Knox Customization menu exists.




If the menu appears, your S8/S8+ is the device configured by KCC. And, you can use Samsung DeX feature normally if you customize your S8/S8+ with the issue via new released patch version.


To apply the patch,


3. Access to the URL “custom.samsungknox.com” on device. And, tap NEXT.


4. Tap FINISH. Then, new patch version is applied.

  If processing is completed, try to activate Samsung DeX feature again.









Pictures/ Images and Screen Images are for reference only.


Thank you for your feedback!

Not finding what you're looking for? We're here to help.


Live Chat Support

Live Chat support with a Samsung product expert.
Operation Hour: Mon - Sat | 9:00am – 6:00pm
Except for public holidays

Send us an Email

We will aim to respond within 24 hours for general inquiry or technical support.

Email to CEO

Contact the dedicated CEO's Office.

On-Site Service Appointment

Find out how you can make service appointment.

Online Pre-booking Service

Product Repair Service, Operating System (OS) Upgrage Service and Gift Redemption

* Mobile Information Transfer Service is now available


36984698Hong kong

Operation Hour:
Monday-Friday: 9am-8pm
Saturday, Sunday & Public Holiday : 9am-6pm

0800 333Macau

Operation Hour:
Monday-Friday: 9am-8pm
Saturday, Sunday & Public Holiday : 9am-6pm

21219088Samsung Pay

Operation Hour:
Monday-Sunday: 9am-10pm

* For Printer inquiry, please visit HP official web page .

Service Support

Samsung Support Centers

Need a repair for your Samsung devices?

Smart Service

Samsung SMART SERVICE allows you to experience a whole range of services, right here at our Samsung Experience Store!

Contact Us