Image courtesy of CGSecurity, see Additional Resources
Things you need⌗
- A copy of Lubuntu
- Windows 10 Install Disc
- An internet connection
Things to remember⌗
- Do not write anything on that disk anymore, you do not want to overwrite anything.
- Image or clone the drive before performing sensitive operations
- I used VMWare Fusion when working with this to connect my SSD (here’s how you can do it too) so I could swap out ISOs and do reboots more quickly
Recovering the partition table⌗
Boot in Lubuntu (you have internet, right?) and
Ctrl+Alt+T (opens the Terminal) and install
testdisk and GParted.
sudo apt update && sudo apt install testdisk gparted -y
testdisk, you’re working with the GPT partition table (if not, this guide won’t work, stop using this guide right now),
start scanning (if you get nothing, deep scan till you get something), select the drives you need (preferably only the partition containing Windows)
and list them as primary partition (once you select it, it will be in beautiful green) and write the partition table to disk, then exit.
Go to GParted and realign the drives in such a manner, that there is a 512MiB FAT32 partition at the start of the drive followed
by whatever you want. At this point, you can also verify that the partition table is what you expected it to be.
You may additionally run
ntfsfix if you feel like.
Recreating the EFI partition⌗
Boot into Windows 10 Setup, go to the Command Prompt and enter
list disk sel disk 0 # Presuming Disk 0 is the intended drive sel part 1 # Presuming Part 1 is the FAT32 partition del part override sel disk 0 # See first remark create partition efi size=512 offset=1 # That's why I asked you to double check in GParted, otherwise this won't work sel part 1 # See second remark format fs=fat32 quick label="System" assign letter=Z: # Change the letter if it errors out sel part 2 # Presuming Part 2 of Disk 0 hosts Windows assign letter=C: # Change the letter if it errors out exit
Okay, we’re done creating our ESP (EFI System Partition) as Windows likes to call it, let’s actually get the firmware onto it
# Change Z: and C: depending on what you did previously cd /d Z: bcdboot C:\windows /s Z: /f UEFI
Yeah, that’s about it!