iPod 5th gen malfunction

Hello I recently found my old iPod 5th gen and it appears to be reset until you try to set up. Then it says I must unlock my old iCloud? How do I figure out my old account or simply reset iPod so I can just re setup? I do not know the account as i let my brother use it maybe years ago and he is no longer available to be reached. It also will not allow me to set it up without WiFi.