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ThinkPad L14 Gen3 Intel USB Boot UEFI Issue

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astounded
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ThinkPad L14 Gen3 Intel USB Boot UEFI Issue

#1 Post by astounded » Thu Sep 29, 2022 6:45 am

Hi all,

I just got my first ThinkPad (L14 Gen3 Intel 21C1 - Windows 10) and need to be able to boot different OS's from a USB stick such as direct to DOS or Linux. I just cant get it to work. Everything appears to be an issue with something called UEFI. Does anyone know how I can get around this either by disabling it all together or with any other work around. Its really annoying.

I tried to make the boot order look for the USB drive first (didn't work)
I tried disabling "Secure Boot" but then I get the message about UEFI key.

Thanks!

dr_st
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Re: ThinkPad L14 Gen3 Intel USB Boot UEFI Issue

#2 Post by dr_st » Thu Sep 29, 2022 7:08 am

I don't know about the Secure Boot stuff (whether Lenovo locked something related to it in newer BIOSes - previously disabling it was trivial).

To boot from USB in a UEFI environment, the USB must be partitioned and formatted in UEFI/GPT mode. Modern utilities will do it. Windows and Linux can boot this way, but DOS cannot be booted directly in UEFI mode.
Thinkpad 25 (20K7), T490 (20N3), Yoga 14 (20FY), T430s (IPS FHD + Classic Keyboard), X220 4291-4BG
X61 7673-V2V, T60 2007-QPG, T42 2373-F7G, X32 (IPS Screen), A31p w/ Ultrabay Numpad

astounded
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Re: ThinkPad L14 Gen3 Intel USB Boot UEFI Issue

#3 Post by astounded » Thu Sep 29, 2022 7:26 am

Thanks this is brilliant info, I will look around to find a utility that can format/image the USB drive in UEFI. Meanwhile if anyone can suggest a suitable util I would very much appreciate a link.

Cheers!

axur-delmeria
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Re: ThinkPad L14 Gen3 Intel USB Boot UEFI Issue

#4 Post by axur-delmeria » Thu Sep 29, 2022 8:45 am

If you're creating a Linux installer USB on Windows, you can use Rufus.
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astounded
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Re: ThinkPad L14 Gen3 Intel USB Boot UEFI Issue

#5 Post by astounded » Thu Sep 29, 2022 11:57 am

axur-delmeria wrote:
Thu Sep 29, 2022 8:45 am
If you're creating a Linux installer USB on Windows, you can use Rufus.
I am about to sit down and re look into this now. I previously used Rufus to make a bootable Linux USB stick but it still would not boot. The issue being that first the ThinkPad needs to be able to boot from the drive, to do this it needs to get around the UEFI issue. Can Rufus create a UEFI bootable usb stick?

dr_st
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Re: ThinkPad L14 Gen3 Intel USB Boot UEFI Issue

#6 Post by dr_st » Thu Sep 29, 2022 1:43 pm

astounded wrote:
Thu Sep 29, 2022 11:57 am
Can Rufus create a UEFI bootable usb stick?
Yes, if it is a recent enough version. I always suggest downloading the newest one from their website.
Thinkpad 25 (20K7), T490 (20N3), Yoga 14 (20FY), T430s (IPS FHD + Classic Keyboard), X220 4291-4BG
X61 7673-V2V, T60 2007-QPG, T42 2373-F7G, X32 (IPS Screen), A31p w/ Ultrabay Numpad

axur-delmeria
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Re: ThinkPad L14 Gen3 Intel USB Boot UEFI Issue

#7 Post by axur-delmeria » Thu Sep 29, 2022 10:33 pm

When using Rufus to make Linux installer USB disks, there's a setting like "DD image mode" that needs to be set/selected. I've done this on Debian installer ISOs.
Daily driver: X220 4291-C91 i7-2620M

Backup: X601 Core 2 Duo T8100
Toy: X60F Core Solo U1300
On loan: X220 4291-P79 i5-2520M
In pieces: two retired but working X61Ts
RIP: 760XD 9546-U9E; X61 7676-A24; and a BOE-Hydis HV121P01-100 in failed SXGA+ mod
:cry:

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