My laptop was stolen and now I got it back it's locked. Wont let me pass the enter master password /invalid password screen..a

Aug 12, 2018
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After getting my laptop back in now locked completely out. I can't get passed the enter master password:invalid password page. I just wanna wipe the whole thing and start it over. I didnt have a lock on it when it was stolen,so now I'm paying for that mistake..did the battery truck no luck,f6,f7..on and on Not working..someone pls pls help.its a Asus A8 Vista windows 8