PMPMS646, PMPMS647 -Vig646M/Vig647M -H61I-E35/W8 / H61I-E35 V2/W8  

BIOS file are available:

For Windows 8 and 8.1 operating system use BIOS: V7.6B6 BIOS file E7677IV1.764      
BIOS E7677IV1 (V7.6B6)                                               
BIOS Date: 15/05/2018