The volume for a file has been externally altered so that the opened. The volume for a file has been externally altered so that the opened file......


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Hello to everyone.


At the beginning I'd installed windows 10 with the legacy BIOS-MBR boot mode,but since I needed a Windows 10 installation that was able to boot using the EFI partition style,I have converted the partition scheme from MBR to UEFI with a tool and after this operation I have reinstalled Windows 10 from an old backup. This backup comes from the old BIOS/MBR installation of Windows 10. When I tried to boot Windows,I realized that it was not able to do that (no error message.but blinking cursor). I have so realized that the EFI partition didn't exist. So,I have created a new FAT32 partition and I have repaired the EFI partition following this guide :


How to Restore Deleted EFI System Partition in Windows 10? | Windows OS Hub


it worked,but only partially. Infact,since I need to put the "TESTSIGNING ON",when I gave this command :


Bcdedit.exe -set TESTSIGNING ON


I've got this error :


The boot configuration data store could not be opened. The volume for a file has been externally altered so that the opened file is no longer valid.


I tried a lot of methods to fix it,but right now unsuccesfully. Can someone help me ? thanks.
 
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Hi ziomario,

it is quite possible that because you choose to use FAT32 instead of NTFS, that is what is causing the problem, if you don't have a ot on the drive, I would reformat it and start again using NTFS and then your back-up!!!. :)
 

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