This guide is for those who already have windows installed but want to get it to dual boot.

1. Add Timeout 10s Upon Boot

sudo nano /boot/efi/loader/loader.conf

Now, you should see default Pop_Os-current in the current file.

Simply write timeout 10 on the new line and press Ctrl-O to save and Ctrl-x to exit.

Try restart your computer, you should see PopOs as option to boot but no windows yet.

2. Find your Windows EFI Partition

Run lsblk

Usually Windows EFI partition size is around 100MB and it is the first partition in the drive.

The one with /boot/efi label is your PopOs EFI partition.

So, in the above image, my windows EFI partition is at sda1.

3. Make Windows Boot Directory

Run mkdir /mnt/windows_boot

4. Mount Windows Boot Directory

sudo mount /dev/yourWindowsEFIparition /mnt/windows_boot

5. Copy Your Directory to Boot Directory

sudo cp -r /mnt/windows_boot/EFI/Microsoft /boot/efi/EFI/Microsoft

6. Create Windows Config File

Head over to /boot/efi/loader/entries by using this command
sudo su [Enter root privileges]
cd /boot/efi/loader/entries

Now create windows file with touch windows.conf
Edit with nano windows.conf and write this 2 line

title Windows 10
efi /EFI/Microsoft/Boot/bootmgfw.efi

Press Ctrl-O to save and Ctrl-x to exit.

Done!

And thats it, you should see windows 10 as option now. Congrats! Please comment down below or contact me if you need any help.