Good, BIOS i build new here https://vinafix.vn/threads/c20-30-all-in-one-lenovo-la-b691p.24033/ C20-30 All-in-One (Lenovo) - LA-B691P Lenovo C20-30 All-in-One - LA-B691P BIOS O1VKT14A Request old BIOS vinafix.com
sir it was no display before but i am confirm its a bios problem because problem came during updating system