Write protection

I am facing an issue in my SanDisk Ultra CZ48 16GB USB 3.0 Pen Drive (Black) after few months of usage it popped up with a 'Write protected ’ warning when i am deleting the files in it i cant i either copy my files to it .is there any way to fix this ?

Try running a chkdsk /f command for the drive. May have to open the Command Prompt as Admin.

not working