Or write directly to eMMC partition (if you control bootloader):

Spending 15 extra minutes to ensure page size, offsets, and ramdisk integrity is the difference between a fragile hack and a professional-grade boot solution.

: If the conversion results in a "corrupt" image, verify the file size. A boot image must often match the exact partition size or be padded with NULL bytes.

🔍 : Use --pagesize 2048 for older Qualcomm devices, or 4096 for newer ones. Mismatch = no boot.

The BCD store has incorrect partition identifiers after conversion. Fix: Mount the boot.img as a loop device and run bcdedit /set ramdiskoptions ramdisksdidevice partition=S: (where S: is the eMMC OS partition).

However, to flash a kernel, modify a ramdisk, or use tools like Magisk for rooting, you frequently need a standard file. This guide explains how to convert boot.emmc.win to a high-quality boot.img effortlessly. What is a boot.emmc.win File?

If you really want to preserve Windows, use kexec + UEFI stub loader: