If it used to work okay I'm afraid there's little you can do. Just replace it. Depending on the brand, these devices can just pack up without warning. That's why they must never be relied on for backups or long-term storage.
your drive may simply have some connection issues. Maybe it is something that you can do yourself to recover data from it. (video talks about sandisk device, but it could happen to any other USB flash drive) How to recover data from USB stick with failed connector
I have a 8gb flash drive , and my system, doesn't reconize what can do?
please unswer Thanks
There can be any number of issues with the drive, it's difficult to diagnose without more information
If your PC does not recognize the flash drive it may not be enumerating the device due to a hardware problem on the usb drive. You can either continue troubleshooting yourself or you can use a data recovery company that specializes in flash drives