1. Update bios under shell commad:
   GO      : Flash EC+BIOS
   GO ME   : Flash EC+ME+BIOS
   GO BIOS : Flash BIOS
   GO EC   : Flash EC 
2.BIOS name rule: 
   Z791ARxx.bin --243HG-000013-HF: FLXC2002G-C4   8G
   Z791ARxx.16G--243HG-000019-HF: FLXC4004G-W6   16G
   Z791ARxx.RAY--243JT-000001-HF: RS512M32LO4D1BDS-53BT  8G