I had this write protected problem with my usb and tried every way of formatting and removing its write proctection to no avail. Sometimes formatting would work but after a while the write protected problem would revert. I then tried using Phison MPall in the hopes of fixing it finally. Unfortunately my usb can now no longer be detected even in disk management. It seems I was rather careless messing it up even more. My question is if there is any way of reviving my usb now that it no longer shows up.