Dual booting Android and Windows seamlessly

Prerequisites

Phone Setup

Adding NTFS Support to android

Install Magisk if you haven't already
Install the NTFS Android magisk module through the Magisk manager

Application Setup

Install the APK provided
Create a folder named "vayu-uefi-2.1.0-release" on your internal storage
Copy all uefi images into that folder
Open the app and allow any root access it wants

PC part

Boot recovery

Reboot to the bootloader
Run fastboot boot <recovery.img> (Substituting <recovery.img> with your chosen recovery)

Transfer some files to the phone

When the recovery has booted run adb shell mount.ntfs /dev/block/by-name/win /win
Run adb shell dd if=/dev/block/by-name/boot of=/win/boot.img
Run adb push switchtoandroid.bat /win/Users/<username>/Desktop/switchtoandroid.bat (Substituting with the username on your windows partition)

Phone Setup (Windows)

Run adb reboot bootloader
Run fastboot boot <uefi.img> (Substituting <uefi.img> with the uefi image for your device)
When the phone has booted to windows install cygwin

Booting to android

Run switchtoandroid.bat on the phone as ADMINISTRATOR

Booting to windows

Run the app
Press "Quickboot to windows"