Remove write protection?

I try to format an USB but it doesn't work because of the write protection.
I tried to solve the problem using regedit, but I didn't have the StorageDevicePolicies folder...I created it and created the WriteProtect thing and value is at 0 but it's still not working.
I tried to solve it using cmd prompt, the "attributes disk clear readonly" command works, but when i enter "clean"
it sais 'DiskPart has encountered an error: The request could not be performed because of an I/O device error'.
The chkdsk h: /f command is also not working.
EaseUS Partition Master is also not working.
Error checking in USB properties detects nothing.
Please
Help
Me.