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I've changed UEFI from Legacy to UEFI Boot using MBR2GPT, setting the boot option to the hard drive, but after mbr2gpt finished, I received an error about an XML file, which I ignored.
Upon rebooting, I receive error:

PXE-E61: Media test failure, check cable

PXE-MOF: Exiting PXE-ROM


No bootable device found. Press any key to reboot the machine

Will resetting the CMOS battery fix this?

JW0914
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lidistat67
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    mbr2gpt doesn't reconfigure your BIOS, it just prepares Windows to boot in EFI mode rather than legacy. You have to manually make sure that EFI boot is enabled. Did you do that? – gronostaj Apr 27 '21 at 10:39
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    “Will reseting the cmos battery fix that?” - it probably will not, you need to disable legacy mode, and make sure you have configured your system for UEFI mode. Hopefully, you have a backup of your drive. – Ramhound Apr 27 '21 at 10:46
  • @Ramhound I don't really mind about the data on the disk. Is there any case that if I put a USB with windows installer in it I can maybe reinstall or repair windows or will I get the same error? – lidistat67 Apr 27 '21 at 11:50
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    Windows is not easily repaired outside of Windows, let alone, attempting to repair an external installation of Windows – Ramhound Apr 27 '21 at 12:08
  • @Ramhound That's the entire purpose of WinRE – JW0914 Apr 27 '21 at 13:02
  • @lidistat67 Provided mbr2gpt assigned the correct GUIDs to the EFI, WinRE, and OS partitions, boot from the Install USB, open a terminal via Shift+F10 and follow Step 5 in the last section of this answer, where C: is the OS partition, which will likely not be C: in WinPE/WinRE - list via Diskpart → lis vol (you'll mount the EFI partition via DiskPart: to verify the correct GUIDs are set, select the applicable partition (lis par → sel par #) → det par and match the GUID listed to those listed via help cre par pri) – JW0914 Apr 27 '21 at 13:10
  • @JW0914 - In all my years of attempting to resolve a crash, that left me with only WinRE, I have never successfully repaired Windows when Windows was unable to do it myself. – Ramhound Apr 27 '21 at 19:55
  • @Ramhound BootRec and BcdBoot fix all boot issues, DISM and SFC fix all Windows system file issues (if without internet access, an install.wim/install.esd from a Windows install ISO is required for DISM), with the two things that can't be fixed without a backup being the user and system Registry hives (located within %UserProfile% & %WinDir%\System32\config - a Task to back up registry hives daily/weekly is a good idea, as they're only ~250MB) and drivers (as of v1809, drivers are backed up to the Component Store (%WinDir%\WinSxS) every time a bi-annual update occurs) – JW0914 Apr 28 '21 at 11:55

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