How to format write protected usb Hope this will help you... for windows only

Click start
then run regedit
go to this directory HKEY_LOCAL_MACHINE\SYSTEM\Currentcontrolset\control\
if you can't find StorageDevicePolicies under control folder
then make some new one. Follow this steps:
step 1:
go to this directory HKEY_LOCAL_MACHINE\SYSTEM\Currentcontrolset\control\
again and right click control folder
step 2:
select new, then click key and rename the new key #1 folder into
StorageDevicePolicies
step 3:
right click StorageDevicePolicies folder and select new DWORD(32-bit) Value
for 32-bit Operating System and select new DWORD(64-bit) Value
for 64-bit Operating System
step 4:
rename dword newer folder into WriteProtect, then double click WriteProtect
and change the value data into 0 with hexadecimal base, Then close regedit
step 5:
open my computer and refresh it 5 times without do anything to your usb, and
properly eject your flash drive
step 6:
plug in your usb again into your computer and format it using exfat instead of fat32
Now, you can use your flash drive again....