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      Summary of changes for BIOS update - ThinkCentre M55p

      version 2MKT49A

      • Fixes the issue where Winphlash tool shows 149 error after resume from S3
      • Updates Winphlash tool

      version 2MKT48A

      • Fixes the audio item in BIOS Setup which does not match with audio support
      • Fixes the corrupted swipe finger message if ide drive password exist
      • Enhances the Security
      • Fixes the problem where USB HDD cannot boot with fat16 format and 50M partition.

      version 2MKT47A

      • Fixes the Recovery fail issue

      version 2MKT46A

      • Fixes the problem where Winphlash tool could flash corrupted BIOS
      • Fixes the problem where Flash BIOS with Winphlash tool causes System reboot and blue screen
      • Updates Winphlash tool

      version 2MKT45A

      • Fixes the problem of bluescreens after resume from S3

      version 2MKT44A

      • Fixes HDD password issue

      version 2MKT43A

      • Updates vbios to 1594

      version 2MKT42A

      • Fixes a problem where the unit power switches off when Intel 100S NIC is installed
      • Fixes a problem where a NMI parity causes system BSOD and the system hangs
      • Fixes a Intel AMT command which caused the system hang

      version 2MKT41A

      • Fixes a problem where the system hangs when install RAID1 with 2 HDD and USB HDD
      • Fixes a problem where power on with some kind of memory would cause system hang up and show rubbish

      version 2MKT40A

      • Fixes the problem where Esc key becomes abnormal when swiped in the fingerprint reader
      • Fixes the problem where PXE booting hangs after running ABORTPXE.COM
      • Fixes the problem where POST error message ("0232: Extended RAM Failed") randomly appears in system with less than 4G memory
      • Updates BAR code
      • Fixes the problem where system escapes pop after ctrl-alt-del when swiped in the fingerprint reader

      version 2MKT39A

      • Fixes the fingerprint keyboard resume workaround

      version 2MKT38A

      • Fixes the fatal error at TP DAh with ATI Fire MV 2400 in PEG slot
      • Fixes the TP 49h hang with HP 82350A GPIB card
      • Fixes the intermittent problem where the hard disk drive gets corrupted
      • Fix the S3 resume failure issue of Windows Vista when a random check for USB mouse or Keyboard is done.

      version 2MKT37A

      • Fixes a problem where the fingerprint reader is not detected
      • Fixes intermittent com port errors in BurnInTest (XP)
      • Reinstates support for certain old USB floppy drives
      • Removes AHCI support from -G/-GF boards even if they have an AHCI-capable ICH SKU
      • Fixes odd behavior on some fingerprint keyboards
      • Fixes a PC-Doctor problem where the keyboard and/or mouse do not work after USB Loopback test
      • Fixes a PC-Doctor problem where the keyboard and/or mouse do not work after many runs of USB Loopback test
      • Updates CPU Microcode

      version 2MKT36A

      • Fixes a failure in PC-Doctor with specific Seagate Nighthawk drives
      • Adds Setup Summary display of memory Dual/Single channel mode
      • Reports cover tamper in DMI Type 3 structure. On tamper, we will set BootUp Status to WARN; otherwise, SAFE
      • Fixes 0162 error after srcmos armsfdd
      • Fixes a problem where the system fails to boot from Corsair Flash Voyager USB key
      • Fixes a problem where the ATI Fire MV 2400 card has two pci devices
      • Fixes AMT error after clearing fingerprint
      • Fixes intermittent AMT "corruption", Setup sub-menu all Disabled
      • Adds the item '/P' in help file ("Readme.1st")

      version 2MKT35A

      • Fixes a problem where the system shows an "Adapter ROM Checksum Error" with PEG card

      version 2MKT34A

      • Fixes a problem where the system fails to detect large (500GB) hard drives
      • Fixes a problem where the system fails to detect a certain nVidia video card
      • Fixes a problem where the USB devices are not recognized normally after S3 when attached to the front USB port
      • If your system contains a Core 2 Duo processor, Lenovo strongly recommends updating the system BIOS which contains updated CPU microcode files

      version 2MKT33A

      • Fixes lurking memory corruption on S3 resume
      • Adds support for USB 2.0 split transaction
      • Adds support for USB provisioning from floppy-formatted key
      • In USB provisioning, instead of zeroing the entire record, zero only the data portion, and the Valid flag in the header

      version 2MKT32B

      • Updates Conroe CPU microcode

      version 2MKT32A

      • Fixes a problem where the system fails to update TCG PP (Physical Presence) from operating system (Move TCG PHS call from _SST back to _PTS, CRB was wrong)
      • Fixes a problem where Quatech dsc-100-550 causes POST error 1805 (Add support for non-PNP option roms)
      • Fixes "Invalid password in case setting pop with ten keys"
      • Fixes a problem where huge hard drives are not recognized
      • Fixes a problem with AMT USB Key provisioning where SETUP.BIN occupies multiple clusters
      • Fixes a problem where GetAssetData fails

      version 2MKT31A

      • Fixes a problem with slow SOL video after POST
      • Fixes a problem where pressing F2 on console side can't make client enter BIOS SETUP when SOL is active
      • Fixes a problem where the system will not boot to network (Actual symptom: Kill AC + battery, won't boot to network on first POST, only second and subsequent)
      • Fixes a problem where an unsupported system shows the Cover Tamper setting

      version 2MKT30A

      • Fixes a problem where a corrupt screen randomly appears at POST screen

      version 2MKT29A

      • Fixes a problem where the hard drive LED is always lit on select systems that have no slim optical drive
      • Fixes a problem where the system cannot detect a PCI-E 1x LAN card
      • Fixes a problem where the system shows a yellow mark for PCI-Express ports under windows when 4GB memory is installed

      version 2MKT28A

      • Fixes a problem where the system hangs at POST screen after ME is disabled
      • Fixes a problem where a USB key for factory mode setup does not work
      • Fixes a problem where a wake event is always logged as 'unknown'

      version 2MKT27A

      • Updates VGA BIOS to build 1371
      • Fixes a problem where the keyboard does not work properly after boot
      • Fixes a problem where a CMOS failure does not reset the Startup Sequence

      version 2MKT26A

      • Enhances Fan Acoustics function in high mode
      • Fixes a problem where 186 and 190 POST errors do not stop POST
      • Fixes a problem where the system hangs at hard drive config screen when install Windows 2000
      • Fixes a problem where the keyboard does not work when install Windows XP with an NVIDIA 7300LE video adapter
      • Fixes a problem where enabling AMT causes the onboard LAN to be unavailable

      version 2MKT25A

      • Fixes a problem where some Setup screens do not match help
      • Fixes boot block recovery from USB CD-ROM
      • Fixes a problem where IGD cannot start in Windows XP with PCIe-x1 card installed
      • Fixes a problem where the system hangs or displays a bluescreen error when insalling Windows Vista with PEG card
      • Fixes a problem where the system hangs after installing ATI X300 driver on Windows 2000
      • Fixes an intermittent hang or bluescreen in Windows XP with Ricoh USB printer

      version 2MKT24A

      • Updates fan control support for the CPUID 0F49 processors
      • Removes exclamation marks in Device Manager when a PCI video card is installed
      • Ensures that the system can boot the primary boot sequence after a dead battery is replaced
      • Updates SMBIOS processor socket information
      • Adds additional TCG Vista updates
      • Fixes a problem where the system hangs immediately after updating the BIOS to level 23
      • Fixes a problem when the CPUID is limited to 3
      • Prevents corrupting boot block if it is updated after completing the manufacturing process
      • Fixes a highly infrequent problem when a USB device is plugged in to the system, BIOS USB keyboard emulation is enabled, and USB control is being handed off to Windows

      version 2MKT23A

      • Various TCG code updates required for Vista
      • Updates the Audio Verb Table for Vista

      version 2MKT22A

      • Corrects a problem setting up the caches on systems with the Intel® Core™2 Duo Processors. It is strongly recommended that systems with this processor update the BIOS to this level.
      • Fixes a problem determining the day of the week when the user sets up a weekly wake-up event through the BIOS Setup program

      version 2MKT21A

      • Fixes minor Setup text issues and corrects the LPT mode and hard drive timeout defaults
      • Fixes a problem where the system hangs during boot block recovery from a USB CDROM
      • Ensures the system will boot to the flash diskette if it is in the diskette drive
      • Fixes a problem that occurs during PXE boot from a PCI network card
      • Ensures we do not get a 1762 POST error when a user plugs in or removes a USB Key and a password is installed or the system uses enhanced POST mode
      • Fixes a problem where there is long delay in POST or the system fails to detect the Sony SDX-470V SATA tape drive
      • Fixes a problem where the system hangs at an "EE" checkpoint with certain processors
      • Fixes a problem where Wake On LAN always follows primary boot sequence
      • Fixes a problem disabling the Wake On LAN function
      • Fixes ASF watchdog timeout errors

      version 2MKT20A

      • Initial Production Release

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      • Alias ID: MIGR-66273
      • Document ID: HT036389
      • Last Updated :17 Jun 2014
      • © 2016 Lenovo