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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](https://superuser.com/a/1581804/529800) 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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