MBR2GPT Not Working (Disk Layout validation failed for disk 1)

I've been trying to convert my boot drive from legacy to UEFI but I keep getting the same error all the time (Disk Layout validation failed for disk 1)

My partitions:

Drive 0 has a System reserved partition set as Active and drive 1 has no Active partition

It seems that you're booting from drive 0 partition 1 and transferring the boot sequence to drive 1 partition 1.
To confirm, shutdown and detach drive 0 (SATA or power cable) and try to boot.
If you confirm it can't boot, I'll give you instructions on how to fix it.

Megahertz said:

Drive 0 has a System reserved partition set as Active and drive 1 has no Active partition

It seems that you're booting from drive 0 partition 1 and transferring the boot sequence to drive 1 partition 1.
To confirm, shutdown and detach drive 0 (SATA or power cable) and try to boot.
If you confirm it can't boot, I'll give you instructions on how to fix it.

I disconnected the power from my HDD and tried to boot and it cannot boot.

This tutorial may be useful:

Convert MBR Disk to GPT Disk in Windows 10

https://docs.microsoft.com/en-us/win...ive-partitions
https://docs.microsoft.com/en-us/win...ive-partitions

Lets rebuild your boot loader on drive 1
Open a CMD window as administrator and type:
diskpart
select volume c
active
exit
bcdboot C:\Windows /s C: /f BIOS
exit

Shutdown, detach drive 0 (unplug SATA or power supply cable), make sure drive 1 is first on the Boot priority and try to boot.

If it boots normally, pen a CMD window as administrator and type:
MBR2GPT /validate (to find out if you able to convert to GPT. Don't convert - Wait for instructions)

Megahertz said:

Lets rebuild your boot loader on drive 1
Open a CMD window as administrator and type:
diskpart
select volume c
active
exit
bcdboot C:\Windows /s C: /f BIOS
exit

Shutdown, detach drive 0 (unplug SATA or power supply cable), make sure drive 1 is first on the Boot priority and try to boot.

If it boots normally, pen a CMD window as administrator and type:
MBR2GPT /validate (to find out if you able to convert to GPT. Don't convert - Wait for instructions)

When entering the command bcdboot C:\Windows /s C: /f BIOS i get this error:

BFSVC Error: Could not open the BCD template store. Status = [c000000f]

Did you use adminstrator cmd ?

SIW2 said:

Did you use adminstrator cmd ?

Just tried again and it worked, i was sure i started it with adminstator
will see if it boots now

Edit:
The computer boots but when entering the command MBR2GPT /validate i get this error:
Cannot find room for the EFI system partition.

Leave the drive 0 detached.

With Disk Manager (C:\Windows\System32\diskmgmt.msc), shrink the C: partition by 120MB. Leave the space as unallocated and run MBR2GPT /validate. Don't convert - Wait for instructions