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Lenovo UEFI NVRAM Nightmare
#1
Hey all, I think I really managed to ruin my new laptop and could use some expertise here

I have a Lenovo U410 Laptop with the latest whitelisted BIOS installed

it has been working fine without any issue until I did the following:

I booted off a USB stick into a UEFI shell prompt (2.0)
that I got here: https://edk2.svn.sourceforge.net/svnroot.../Shell.efi

I was following instructions here on editing my list of UEFI boot items:
https://wiki.archlinux.org/index.php/Uni..._Interface

it was my goal to add my Windows 8 UEFI boot loader onto the list of available options so I could install Windows 8 onto my GPT formatted HD (i have linux already installed and didn't want to convert to msdos partition scheme)

I used the 'bcfg boot dump' command which listed all of my default bios boot options including one annoying one called '\Windows Boot Manager' that was pointing to a no longer existing efi file..

I deleted a few that I would never use, like Lan boot and some others
then added the cdrom-boot.efi file from my USB stick..

Upon Reboot I can no longer access my BIOS via F2 or Fn-F2 or my Boot menu via F12, the system immediatly tries to boot onto USB stick,
And persists until a USB stick is interested it just sits at black screen..
Once a bootable USB is inserted it boots up fine..
I have one with LILO on so I'm able to boot my linux partitions just fine..


I think I broke my BIOS!!
I unplugged the battery and CMOS battery and restarted the machine, but no HELP!! same Issue!!

I even booted a windows PE environment and Re-Flashed the Bios!!
but same problem..
every time i boot into the shell the same 'bcfg boot dump' enteries persist.. I think they are stored somewhere in NVRAM, but I don't really understand how BIOS NVRAM works..

Can someone help me!!
I'm guessing that if i can wipe/format the NVRAM perhaps it will auto fill with default settings?!?!? not sure, I also don't really know how to do that..
I'm scared to wipe the NVRAM and brick my system..

I can boot linux off my USB stick boot still, and tried wiping the /dev/nvram device, this only resets the RTC clock but not the rest of NVRAM..

any help would be great!! I have screen captures and text dumps from UEFI shell also if those help.!!!

Help!!
If I can't get into My bios I'm screwed!! the Bios Reset also broke some other bios default settings that I need to change (ie. Virtualbox no longer works.. among other things)
find
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