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.

How can i root clone samsung a500

Hello, everyone....
i bought a korean copy samsung galaxy a500...
Model: SM-A500
Android Version: 4.4.4
Build ID: KTU84P.A500ZCU1ANL3
Board ID: MSM8974

i tried to root this phone via iroot, kingroot, kingoroot, srsroot.... no one is working to root my device.
kingoroot give root succeed sometime, but its not installing supersu properly and after rebooting device lost root success itself... anyone have idea to fix it?