Windows 10: Converted disk successfully from Legacy to UEFI & T470 won't boot

Hi everybody, thanks for reading... I have a T470 that I ran the "MBR2GPT.exe /convert /allowfullos" command on and received the message: "Before the new system can boot properly you need to switch the firmware to boot to UEFI mode!" I've been in the bios and made sure the boot mode was set to "UEFI only" and turned off all CSM features. When Windows 10 boots it gets only a spinning wheel and it never boots. I have tried Start Up Repair but that would not work. Are there any common solutions I may be missing? I assume the data it still recoverable if I slave the drive. Thanks! Jonathan

:)

 

Legacy to UEFI boot

Hi Guys,

Is it possible to perform a disk partition and firmware boot to UEFI through cmd or powershell without rebooting the device and manually changing the info at the BIOS? I should say that I am attempting to do this remotely with no physical access to the device.
It is a Dell laptop which I am attempting this on.

So far I have this (cmd):

mbr2gpt /convert /allowfullOS

shutdown /r /fw

It converts to GPT successfully then I get the following error message when attempting to boot through UEFI:

"boot to firmware ui is not supported by this systems firmware"

Any help is much appreciated

 

Notebook boots in Legacy not UEFI

Hi HannanShaikh,

You can convert your Legacy mode drive to UEFI boot anytime, visit this link:
Windows Setup: Installing using the MBR or GPT partition style for a comprehensive guide to reformat your hard disk to boot it to a UEFI mode.

The option to "Boot the PC to the DVD or USB key in UEFI mode" is also provided there.

Make sure that you use the same USB drive which already matched the edition of Windows 10 for your computer.

If you continue to have this issue even after performing the above steps, please reply to this thread. The system will notify me so I can get back to you and provide you more answers.

 

Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  


Here it is: