Lenovo Yoga Flex 2 :: 15D - Boot Fail After Latest BIOS Update

Dec 11, 2014

I have a severe problem (I guess) after the latest BIOS Update. Windows 7 freezes during startup.

I own a 64-bit Lenovo FLex 2 15D with AMD A6-6310 and R4, 4GB RAM and a SSHD (8GBSSH). I purchased it without OS and installed Windows 7 - which worked fine so far.

I yesterday updated the BIOS with version 9FCN23WW (for Win7 and Win8), the latest BIOS update. A mistake, it seems.

After Reboot, I first had to disable Secure Boot in the BIOS, because it would not let me boot at all. I figured out how to get into the BIOS-Setup to disable this (press Enter 2x, press Tab when in the Boot Menu to access the "Apps Menu", then "SETUP").

Now Win7 begins to start up, but freezes during the startup process (the splash screen with the win flag freezes and looks a bit strange. I used the "protected mode" Windows Startup and saw that the process always hangs when loading "amdkmpfd.sys".

That is basically it.I guess I have to find a way to re-install the previous version of the BIOS.

Now about what I did to fix this (poor, but I tried):

If I try to start from a Win7 installation CD-ROM (actually it is one for Dell PCs, but I guess that is not the problem) and press a key to boot from CD, Windows loads files, shows "Starting Windows"  and at a certain point again just freezes. When I -do not- press a key, WIndows Boot Manager shows up and mentions that "Windows failed to start (etc.)" "File: EFIMicrosoftBootBCD" "An Error occurred while attempting to read the boot configuration data."

I can't even boot into Linux on a USB stick, because the Windows "Error Recovery" won't let me when I try (just offers to boot to Win7 in protected mode - it could be that it fails immediately and jumps back to Win Startup).

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Lenovo Yoga Pro 2 Flex :: BIOS Update Now System Won't Boot

Dec 4, 2014

I wanted to do a fresh install but my restore files are in Windows 8 and I wanted 8.1. I used my 8.1 pro disk and created a bootable media for installing using USB. I had to go into the BIOS and change it to legacy before it would see the USB drive. Went ahead and deleted all the partitions then created a single new one for windows. The installation worked flawlessly then I went ahead with the driver installs.

The very first driver was the firmware update. The system updated the firmware without any issues but once it rebooted I only receive the following message "Default Boot Device Missing or Boot Failed. Insert recovery Media or hit any key. The select 'boot manager" to chose a new boot device or to boot to recovery media. When I go hit any key it leaves me with no boot options probably due to them being legacy options. I've tried F2 on startup to get into the bios and change it back to legacy but this never works.. I have also tried F12 trying to get it to let me select the startup drive.

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Nov 24, 2013

I have a Yoga 2 Pro. How can I find out if I need to update the BIOS?

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Dec 10, 2013

I just formatted my yoga 2 pro, downloaded the drivers and ran the Bios Update. I followed the instruction on the read me, ran the .exe, clicked next/ok until the laptop restarted and if I'm not mistaken a red menu with a progress bar showed up. At that point I left and when I came back a few minutes later the laptop was turned on, the screen lighting was on but the display was black, the keyboard backlights were also turned on and everything else was off. The lights on/near the power button that signal if it's turned on and plugged to the AC are turned off.
It's been like this for over 30 minutes now, no signs of progress. I'm not very keen on turning off or unplugging the laptop while flashing the BIOS, but at this point there's not much else I can do.

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My new Yoga 2 Pro has a secondary display connected through the micro HDMI port. This worked like a charm initially. But after upgrading to newest Windows 8.1 (this is done automatically) it no longer outputs anything to the micro HDMI port. Display and cable is fully functional. But even though the display is powered on, the computer fails to register it and apparently it cannot output anything. Seems like the micro HDMI port is non-existing.
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First I thought it's some weird Windows driver issue but the thing that is different is that when booting (grub) or in BIOS - the keyboard and mouse don't work there as well indicating that apparently BIOS doesn't enable it at boot.
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What works under Windows anyway is charging USB devices - so apparently something comes through that port.

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So now when I try to boot - for a quite some time there is a black screen and then a list of boot options pops up:

Normal Startup ,   bios setup , boot menu ....   but the keyboard is not working at all.

So after connecting a usb keyboard I entered boot options and there iv noticed something strange:

Link to image

EC version is messed up.

Keyboard is not working at all and some other things.

On top of that when I'm choosing normal startup the windows "wheel" is turning but its newer getting to boot.

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I can enter the bios and change the settings, but none of them seem to work because this is the maximum where it will go, the only difference is when I change from AHCI to Compatible mode, it restarts and than I have a blank screen, I have to use the One button Recovery to get back to this one from the picture above...

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