安装 MFT
首先，在 https://network.nvidia.com/products/adapter-software/firmware-tools/ 下载 MFT，和 mlxup(官方在线更新程序) https://network.nvidia.com/support/firmware/mlxup-mft/ ，按照指示解压安装，安装后，启动 mst 服务，就可以使用 mlxfwmanager 得到网卡的型号以及固件版本：
Device #1:
----------
Device Type: ConnectX4LX
Part Number: MCX4421A-ACQ_Ax
Description: ConnectX-4 Lx EN network interface card for OCP with Host Management; 25GbE dual-port SFP28; PCIe3.0 x8; ROHS R6
PSID: MT_2470112034
PCI Device Name: mt4117_pciconf0
Base MAC: ec0d9a8d094a
Versions: Current Available
FW 14.32.1010 N/A
PXE 3.6.0502 N/A
UEFI 14.25.0017 N/A
Status: No matching image found使用 mlxup 在线更新
尝试使用mlxup在线更新时发现所提供的固件版本与官方目前的固件版本相差甚远，最多只能更新到14.32.1010，逐放弃，下载最新固件进行手动更新。
Device #1:
----------
Device Type: ConnectX4LX
Part Number: MCX4421A-ACQ_Ax
Description: ConnectX-4 Lx EN network interface card for OCP with Host Management; 25GbE dual-port SFP28; PCIe3.0 x8; ROHS R6
PSID: MT_2470112034
PCI Device Name: mt4117_pciconf0
Base MAC: ec0d9a8d094a
Versions: Current Available
FW 14.21.2320 14.32.1010
PXE 3.5.0305 3.6.0502
UEFI N/A 14.25.0017
Status: Update required手动升级固件
PSID 可以看到是 MT_2470112034，可以在 https://network.nvidia.com/support/firmware/firmware-downloads/ 处寻找最新固件，注意需要保证 PSID 一致。
下载解压后得到fw-ConnectX4Lx-rel-14_32_1900-MCX4421A-ACQ_Ax-UEFI-14.25.17-FlexBoot-3.6.502.bin 文件
CMD输入 mlxup -i C:\fw-ConnectX4Lx-rel-14_32_1900-MCX4421A-ACQ_Ax-UEFI-14.25.17-FlexBoot-3.6.502.bin 指定固件开始更新。
Device #1:
----------
Device Type: ConnectX4LX
Part Number: MCX4421A-ACQ_Ax
Description: ConnectX-4 Lx EN network interface card for OCP with Host Management; 25GbE dual-port SFP28; PCIe3.0 x8; ROHS R6
PSID: MT_2470112034
PCI Device Name: mt4117_pciconf0
Base MAC: ec0d9a8d094a
Versions: Current Available
FW 14.32.1010 14.32.1900
PXE 3.6.0502 3.6.0502
UEFI 14.25.0017 14.25.0017
Status: Update required
---------
Found 1 device(s) requiring firmware update...
Perform FW update? [y/N]: y
Device #1: Updating FW ...
FSMST_INITIALIZE - OK
Writing Boot image component - OK
Done
Restart needed for updates to take effect.更新完成，重启系统。