This package NVMDowngrade_Package_Silicom_205_2 is for downgrade fw PE425G2i81-XR-FU from ver.4.50 to PE425G2i81-XR ver.4.40 ============================================================================================================================ Operating System Support ======================== E810_NVMDowngradePackage_v4_40_EFI.tar.gz - for EFI x64 E810_NVMDowngradePackage_v4_40_ESX.tar.gz - for ESX x64 E810_NVMDowngradePackage_v4_40_FreeBSD.tar.gz - for FreeBSD x64 E810_NVMDowngradePackage_v4_40_Linux.tar.gz - for Linux x64 E810_NVMDowngradePackage_v4_40_Windows.zip - for Windows x64