Acer A500 No boot loader no rom any sugestions ho to fix?

Hi i bought Acer A500 from ebay, i do have problem with this device. When i power on this device it stuck on black screen with white logo ACER saying boot verified failed. Recovery mode is not working to. Pressed power + vol down and all is saying is Boot recovery kernel image Recovery verified failed. So i do have problem because when i power on acer my pc do not see device because acer freeze on acer logo. Tried even update.zip on sd card bot i do have same message. Please help as i spend money on acer and is not working seller disappeared.