Hi Taniarto,
Dear member of SanDisk Community, welcome.
Please, do not grieve friend.
To narrow down the issue, try the pendrive in other computers.
If still giving write protected, is that he died, ist kaputt…
Can return it.
Please back up your data, and contact SanDisk Technical Support who will replace the device, if it’s authentic and within warranty.
SanDisk Technical Support: http://www.sandisk.com/about-sandisk/contact-us/
To understand this problem, see link: http://forums.sandisk.com/t5/All-SanDisk-USB-Flash-Drives/HELP-how-do-i-reomove-write-protected-message-from-my-16gb-flash/m-p/323924#M8925
Luck.
Regards, Alfred. (Google translated)
