"How to erase and format a write-protected USB flash drive & pen drive"

Using Regedit.exe

Click Start, type Regedit in the search box, click Regedit.exe to open the Registry editor when you see it is displayed at the top of the list. And then navigate to the following key:

Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies

Double-click on the WriteProtect value in the right-hand pane of Regedit.exe. Change the Value data from 1 to 0 and click OK to save the change. Close Regedit and restart your computer. Connect your USB flash drive or pen drive again, and you should find the write protection is removed and the device is no longer write protected.