Im really need help..im flashing bios v1.15 and that bios increase voltage in gtx660m on my lenovo y580. Before flash v1.15 bios..i just flash v2.07 unlock bios because my stock bios is v2.07..after flash v1.15 bios my laptop having a black screen when turn on..im recover my bios with method i found on google..everything fine..but i flash again bios v1.15 and now my laptop cant recover bios..how to solve this problem? But bios v1.17 its fine.. sorry for bad english language