connected USB device is not supported , but there was CHARGING problem. help

[Samsung_I4OLR3Z]

HELLO DEAR ,

I have a very big trouble in my Samsung m40 device.

When I connect my usb type-c charger cable then there was no problem.but When I just turn off my cable then it's says that "the connected USB device isn't support.

AND AFTER THAT, there was no connected car but it always shows that notification  and also vibrate my phone ..in notification settings g in android system there is  a option which name is alerts  ,  I just can minimise the notification what is always says that 

"The connected usb device isn't supported.BUT IT DOESN'T HAVE ANY CHARGING PROBLEM.

BUT IT ALWAYS SHOWS ME THAT.. 

PLEASE TELL ME WHAT WILL I DO ?

I AM REALLY REALLY IN A VERY BIG TROUBLE FOR THIS MATTER.

PLEASE HELP ME

THANK YOU.

DIPRO 

[Smokeythephone]

did this get fixed? I have the same issue

[Members_mLszvev]

I too have the same issue. And it works perfectly when connected Laptop.

Any solution pls?

[Smokeythephone]

Got fixed. You need to use a dry cloth and clean the USB port. 

[robinmym]

I face the same problem.

What is the solution? 

[Cicciput74]

Today I was able to fix it. I had only clean as much as possible the usb c port of my Note 10+ and it is now working as before

[Smokeythephone]

the cleaning worked for me also

[Samsung_jciQO4w]

Hi this does not work.

[Hemanth1199]

connected usb device is not supported

[Zorigtbaatar]

Help mi my phone device not supported 

The connected usb device isn't supported 

[Samsung_jVFIBnt]

USB device isn't supported . Fix it plz