Same server model, tried the BIOS 3B14.02 provided by Gongman66, thanks, already upgraded to 3B14.02 from 3B04 and it works, the steps:
1) Boot by WinPE 11 x64 USB disk
2) Run "BIOS_win64.cmd" directly, it warns "maybe not the right version for this motherboard", anyway, continue to flash...