My Pendrive is not working ,after using all commands..,

Hello, sir

mere pas sandisk 8gb pendrive hain., usmein error aa rahi hain write protected kr ke..,
meine regedit mein ja kr , aur cmd diskpart sub try kr liyafir bhi the disk is write protected dikha raha hain .., or cmd mein format krne ki koshis karta hoon to bhi media write protected kr ke error aarahi hain..,,
so sir.., pls Halp me Ab mein kya karoon.