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38142
October 29th, 2018 03:00
3060, reinstalled Windows 10, can't boot
Hi
I just reinstalled windows 10 pro on a optiplex 3060, on a new ssd hd.
Had to enable legacy external device boot on BIOS in order to boot from USB and install windows, but everything went fine. I've rebooted a couple of times, the pc first checks the USB then boots from HD. No problem.
If i try to boot without USB, SupportAssist tells me that "No bootable devices found"
How can i solve this problem?
Thanks in advance for all the help and sorry for my bad english
Enrico
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speedstep
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47K Posts
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April 11th, 2019 04:00
Legacy MBR booting is not allowed on systems past Skylake. No boot device found when you change the Boot sequence to Legacy mode
You must use UEFI GPT .These specific systems are based on the 7th generation Kaby lake processor (and above) and are designed to boot exclusively in the Unified Extensible Firmware Interface (UEFI) boot environment. As a result, if legacy boot mode is selected, the system will not boot.
Secure Boot must be off for older bios when using windows 10 vs windows 8 or 8.1
Intel will also drop the Compatibility Support Module (CSM) from their reference UEFI code in CLASS 3 UEFI Bios. In 2020 Flash is going EoL, Windows 7 is going EoL, and now Everyone is killing off legacy boot support for hardware. Windows 10 will be the only os from now on.
https://www.dell.com/support/article/us/en/04/sln301692/no-boot-device-found-when-you-change-the-boot-sequence-to-legacy-mode?lang=en
speedstep
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July 8th, 2021 10:00
@GustavoAtaide
Image Option: select Windows to GO.
Windows 2 Go was removed from windows.
https://docs.microsoft.com/en-us/windows/deployment/planning/windows-10-deprecated-features
The feature does not support feature updates and therefore does not enable you to stay current. It also requires a specific type of USB that is no longer supported by many OEMs.
joeg4go
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March 5th, 2025 02:02
I spent 2 days trying to get around this. I wasn't aware of the limitation on 7th gen and newer CPUs not booting MBR Windows Installations. I'm still not convinced this is a CPU limitation and I blame Dell. Their Bios does not give you the option to select an MBR HDD/SSD with legacy boot enabled, but the machine will boot an MBR USB Windows 10/11 Installation USB. If you don't press a button to boot the USB, it will continue to boot the MBR Windows 10/11 installation from the internal SSD/HDD.
The solution is to convert your MBR disk to a GPT disk and enable UEFI. The windows tool for doing this, MBR2GPT.EXE, is very picky and probably won't work in 99% of scenarios. It certainly didn't work for me. WHAT DID WORK FOR ME was to purchase EasUS Partition Master, which includes a disk converter with many options. See the screenshot. I have had mixed results with Easus partition master over the past 12 years, but today it came through. I hope this post will save someone the pain and frustration I experienced trying to figure this out.