Error code after update File:\EFI\Microsoft\Boot BCD Error Code 0xc0000185 BSOD

Insert windows 10 bootable DVD or USB and go to installation.

• Choose 'Repair Your Computer'.
• Choose 'Troubleshooting'.
• Choose "Advanced Options'.
• Next choose 'Command Prompt'.

Next, Use the DISKPART tool to verify that the UEFI partition has a drive letter assignment.

Enter 'DISKPART' (Enter)

(In this test case we removed all other drives except the boot HDD and DVD, so we know the disk 0 is our boot HDD)

DISKPART> sel disk 0

Disk 0 is now the selected disk.

DISKPART> list vol

There was no drive letter assignment to our UEFI partition (volume 3) so you need to assign a drive letter.

DISKPART> sel vol 3

Volume 3 is the selected volume.

1-If you know that you have a extra drive letter available use it here, otherwise skip to 2.
     DISKPART> assign letter=E:

2-If you are unsure what the drive chain is or if you don't know what drive letters are avalable use:
     DISKPART> assign

If all went well, DiskPart successfully assigned the drive letter or mount point. You can verify that a drive letter was assigned by "DISKPART> list vol" again.

Exit DiskPart tool (Enter EXIT)

Next, we need to change to the boot folder on the UEFI volume.

Change to the UEFI volume into the boot folder. Use drive E: here or whatever drive letter was assigned above.

cd /d E:\Boot\

We need to enter three command lines to repair the BCD store.

For MBR drives: (Drives < 1TB)

1. bootrec /fixboot
2. bootrec /fixmbr
3. bootrec /rebuildmbr

For GPT drives: (Drives > 1TB)

1. bootrec /fixboot
2. bootrec /rebuildbcd