How to remove write protection from usb flash-drive?

USB Flash Drives All USB Flash Drives
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i have San Disk Cruzer Blade USB Device 8GB

1.the registry under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies.
  The value ‘WriteProtect’ should be absent or set to ‘0’.

2.Write protection ON or OFF button on stick then

  1. Shutdown your computer or laptop
  2. Insert USB Memory Stick into your laptop or Computer
  3. Turn on laptop and then immediately start pressing (F8) key then Advanced Boot Options screen will come up
  4. Select Safe Mode with Command Prompt
  5. After loading files if your USB Memory Stick drive letter is (G) for example then write as
  6. C:\windows\system32>G: and press enter
  7. G:\>format G: and press enter
  8. If ask you (Y/N) then press (Y) and press enter

3.USB Storage write protection (Fix)

  1. Start > Accessories > Run Command Prompt As Administrator
  2. type > >chkdsk t: /F /X
    (use your own drive letter where f: is)

4.Low Level Formatter  software
5. disk getory recover
6. Hard disk washer
7.partition manager
8.Active kill disk

i followed all these files and software and many cmd command  but could not remove write protect …what do i do?