Windows 10: io1_initialization_failed after rebuilding BCD

after reinstalling the EFI partition bootrec seems to have installed UEFI instead of legacy into the EFI partition which causes windows to give an error io1 initialization failed, i've been trying for hours to get this to work, forcefully booting in legacy mode from a usb stick and it still installs UEFI according to bios

:)

 

Steps to Rebuild the UEFI Boot Partition and for Rebuild BCD

Can someone please Lay out the Steps (Precisely) to Re-Instate the EFI Boot Partition and the Steps (Commands) to Rebuild the BCD for UEFI

 

How to clean up BCD entries? Rebuild the BCD?

This is normal that under Recovery Environment, The letters are re-assigned. This is why you have to be careful and select the correct one.
@dictum
Advice: Never use Easy BCD with Windows installed using GPT disk. Use Easy UEFI instead provided you know what you are doing. Easy BCD only works with MBR disk type.
Base on the screen shot above. Your disk 0 is your new Windows and your disk 1 contains the old Windows. Disk 3 contains a 512MB Fat32 partition and I don't know what that is. I suggest you disconnect disk 3 for now before proceeding.

Let rebuild new BCD's for both disk 0, and disk 1. Please follow step by step on the 2 screen shots below. On step 3, write down the drive letter for PM981_New. In the screen shot, My Windows is still assigned to C but it might be different from yours. In step 10, if the drive letter is different than C, then use the letter in step 3.

Do exactly the same for disk 1, this time select disk 1 in step 4 and assign letter V in step 7, Use V and the drive letter for Old Windows in step 10. This will create a new BCD for PM981_Old and you will be able to boot separately from boot menu.

From boot menu, select which one to boot from.
Once booted into Windows. If you wish, you can set up dual boot for Windows old & New. Under This PC, look for the drive letter of the offline Windows and type:
bcdboot X:\Windows where X is the letter of the offline Windows

 

Steps to Rebuild the UEFI Boot Partition and for Rebuild BCD

Hello Nasho. I'm Greg, here to help you with this.

Did the EFI System partition get deleted? If so here is how to recreate it from scratch:

http://woshub.com/how-to-repair-deleted-efi-par...

All steps are here to repair or rebuild the BCD:

https://www.lifewire.com/how-to-rebuild-the-bcd...

https://www.thewindowsclub.com/rebuild-bcd-wind...

For the issue of Total Identified Windows Installations: 0 try these steps:



Everything else to get WIndows 10 started is here, including at the end a rescue install where you shrink C or a data partition to install Windows 10 to a Dual Boot, if it starts the old install you can then delete the Rescue install and use the new EFI System partition it creates:

http://answers.microsoft.com/en-us/windows/wiki...

Feel free to ask back any questions. Based on the detailed results you post back, I will have other suggestions if necessary.

______________________________________________

Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.