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[Request] Bios unlock for Lenovo Legion Y720T-34ASU
#1
I would like to enable AMD Virtualization. The option is hidden right now. This is the link to the latest bios version. https://download.lenovo.com/consumer/des...y24usa.exe Any help would be appreciated. Thanks.
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#2
(02-26-2018, 10:07 PM)FatGuy Wrote: I would like to enable AMD Virtualization. The option is hidden right now. This is the link to the latest bios version. https://download.lenovo.com/consumer/des...y24usa.exe Any help would be appreciated. Thanks.

I'm looking for the same thing.

There have been two BIOS updates since the original post, but still no AMD-V option according to the changes.txt.
https://download.lenovo.com/consumer/des...y26usa.exe
(the files can be extracted from this .exe with 7z)

Does anybody have any ideas?  I'd rather put pressure on Lenovo themselves to fix this glaring oversight than to harass volunteer hobbyists, of course.  At least I know I'm not alone in wanting this option.

I run Linux, so my next battle will be figuring out how to flash the BIOS safely without Windows.  (The changes.txt mentions a CD image and DOS package, but only the Windows utility is actually included.)  But, one step at a time.
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#3
(07-24-2018, 04:01 PM)penduin Wrote:
(02-26-2018, 10:07 PM)FatGuy Wrote: I would like to enable AMD Virtualization. The option is hidden right now. This is the link to the latest bios version. https://download.lenovo.com/consumer/des...y24usa.exe Any help would be appreciated. Thanks.

I'm looking for the same thing.

There have been two BIOS updates since the original post, but still no AMD-V option according to the changes.txt.
https://download.lenovo.com/consumer/des...y26usa.exe
(the files can be extracted from this .exe with 7z)

Does anybody have any ideas?  I'd rather put pressure on Lenovo themselves to fix this glaring oversight than to harass volunteer hobbyists, of course.  At least I know I'm not alone in wanting this option.

I run Linux, so my next battle will be figuring out how to flash the BIOS safely without Windows.  (The changes.txt mentions a CD image and DOS package, but only the Windows utility is actually included.)  But, one step at a time.

Maybe you didn't need to flashing bios ,it also can enabled Virtualization feature.
Visit this thread and make a efi sell usb stick then going to efi shell environment.
https://www.bios-mods.com/forum/Thread-R...-EFI-shell

Type command  "setup_var 0x145 0x01" ,it should can enable SVM Mode.
It like setting bios value ,if you load default or clear cmos or others  ,it need run again.

[Image: 1Z8K89e.jpg]


There are two group of menu on bios ,but i don't find hidden one where module it is ,sorry.
Another ,do you know afu has EFI and LNX version ??

771 to 775 micro code modify >>>click

My bios unlock >>> click

donate me >>>click


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#4
Holy smokes genius239 ...your screen name is entirely appropriate!

penduin@flux$ sudo dmesg |grep -i kvm
[    7.894744] kvm: Nested Virtualization enabled
[    7.894840] kvm: Nested Paging enabled

SVM has indeed been enabled!  You did it!  Thank you, thank you thank you!
(And of course the real test, running 64-bit VMs at full speed, works too :^)

I will say, that customized grub BOOTX64.EFI was just about the scariest thing I've ever used, warning I could brick my hardware, calling out a completely different computer by name, just terrifying.  But, "setup_var 0x145 0x01" absolutely did the trick!

For convenience, I'm attaching the file here and spelling out the steps I took:
- use a Lenovo Legion Y720T-34ASU (AMD)!  (any other model is a risk I would not take!)
- extract genius239's rar file to a FAT-formatted USB stick (most are already formatted this way)
- verify the USB drive contains EFI/BOOT/BOOTX64.EFI folders and file
- reboot and hit f12 during boot to enter the boot menu
- choose your USB drive, UEFI mode (not legacy)
- at the yellow prompt, enter "setup_var 0x145 0x01" (no quotes, zeroes)
- after the scary yellow warnings, you're done!  ctrl+alt+del and boot normally.

genius239: Thank you!  For a tinkerer like me, this is a great solution.  Naturally, I'm also very curious!  That output, those options you found and highlighted -- how did you figure this out?  What tools and/or documentation did you use?

I still want Lenovo to fix this on their end, of course, but for those of us who are too impatient for that, this is just the workaround we need!


Attached Files
.rar   EFI Shell.rar (Size: 33.02 KB / Downloads: 10)
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#5
Dam... this actually worked for me too! This one has been driving me crazy. Never again will I buy Lenovo! Thank so much!
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#6
Hi,


I have the same problem but a different computer (Lenovo Flex 15D, AMD-A6, Win7). This is the closest to a solution I've found on the internet but am quite illiterate when it comes to BIOS mods. I don't want to risk ruining my computer but really need to get virtualization working.

Would these steps work for me? Is there anything that I'd need to change?

Thanks so much for any help,
JR
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#7
(08-27-2018, 08:54 AM)JohnnyRaylander Wrote: Hi,


I have the same problem but a different computer (Lenovo Flex 15D, AMD-A6, Win7). This is the closest to a solution I've found on the internet but am quite illiterate when it comes to BIOS mods. I don't want to risk ruining my computer but really need to get virtualization working.

Would these steps work for me? Is there anything that I'd need to change?

Thanks so much for any help,
JR

I am no expert either, but here's what I told myself when deciding to risk this operation in the first place (let alone on different hardware).  This is a temporary hack; if one later goes into the BIOS and saves settings, then this hidden KVM flag will be reset.  That suggests that if I were to mess up completely and leave my BIOS unable to boot, popping out and replacing the CMOS battery (coin-sized, visible right on the motherboard) should get the machine back to its stock BIOS configuration, no worse off than when I started.

On a different machine with a different CPU, I would not be confident that this same exact command would work as intended.  But really I have no reason to guess one way or the other -- our BIOSes could be identical for all I know.  I think (I _THINK_!) any trouble you could get yourself into would be reversible by popping the CMOS battery, but I am not speaking from experience, not with this particular trick anyway.

So there's my two cents.  Whether to try it is up to your own judgement, of course.  Lenovo REALLY needs to fix this; I'm not sure what would be our best means to make some noise about this issue, but they can't keep selling modern computers with KVM disabled, it's just ridiculous.
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