Discalmer
It might be risky to upgrade the firmware in any device. You can easily end up with a unusable device(aka brick).
I personally not recommend to do it, if a system is stable you wouldn’t win much with a newer FW.
I told you, it’s your responsibility if something goes wrong during the firmware update!
But life is not so easy can have pretty much the same experience with a Windows update.
Start the exe
You can download the update package from manufacturer’s site.
upgrade the firmware from Windows is generally a not-100%-safe move
Click trought the well known next-next-finish combination. But, wait…
I have a Linux distribution
on the main hard drive. I don’t want to mess with Bill’s creature.
But you might have an old and small USB flash drive with a bootable MS-DOS or FreeDOS.
I prepared all the binaries from Lenovo’s package.
Steps
- Fully charge the notebook, plug in both battery and the adapter,
- enter the bios and load the default settings (recommended),
- enable the BIOS Back Flash on the Configuration tab, if you want to downgrade (optional).
- Extract the archive to the root of the bootable DOS device,
- check the file integrity after the copy (strongly recommended)
- boot the DOS up,
- call Dosflash /help on the parent directory and
- take your time and read the options.
- I executed dosflash /bak oldbios.bin (to dump and update(!) the current UEFI and EC FW).
- the machine will reboot soon and start the upgrade procedure.
- After another reboot you should be able to enter the bios and check the version.
Changelog A4CN43WW (2018-01-18)
- Fine tune battery charge/discharge remaining time issue.
Download
https://mega.nz/#!2B8W2AIA!iIqOkblQtfW0vOQfQ2UfPr8Vb5SnHKySLLvzPlRQ4ew
Changelog A4CN42WW (2016-07-27)
- Fix UEFI Mantis issue No.1622 that DHCP boundary check issue.
- Fix UEFI Mantis issue No.1610 that Hypervisor security bypass issue.
- Fix UEFI Mantis issue No.1657 that SMM callout vulnerability issue.
- Fix unable to flash BIOS by Winflash after set HDD password.
Download
Changelog A4CN40WW (2015-09-01)
- Exchange Lenovo new Logo.
- String changed “Win8 64bit/Other OS” to “Enabled/Disabled” at BIOS setting menu.
Download
https://mega.nz/#!bNtA0QYK!CAr7oI8mcw3PPGsfHteyGDp5G50k7tZ11P5el5KZV3Q
Changelog A4CN33WW (2014-10-21)
- Add for UEFI security vulnerability issue1: Unauthorized Modification of UEFI Variables in UEFI Systems Enable secure BIOS.
- Add patch for UEFI security vulnerability issue2: UEFI EDK2 Capsule Update vulnerabilities.
Download
https://mega.nz/#!fRUinYjQ!GIBWPwr8OOwhhaNrcPQ5to_4nl4OM9woEz7ybCTUiGg
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