USB Disk Read-only, cannot format - Turn off write-protection

I have a USB disk which does not allow me to format/mount/unmount or created partitions on it. Using dmesg | tail gives me the following result: I found this post on AskUbuntu and tried using the accepted answer. I get the following result, but it is still read-only: umount doesn't work. Says umount: /dev/sdc: not mounted Any help on how to remove the write protection will be much appreciated.