A developer's log details the challenging journey of building a UEFI bootloader for ChronOS. Initially blocked by WSL permission issues, the breakthrough came by adopting MinGW-w64 via MSYS2, which natively produces the required PE32+ executable format. This shift eliminated the need for complex ELF-to-PE conversions.

After creating a compatible Makefile and EFI support shim, the build succeeded. The bootloader was deployed to a USB image and successfully booted on a 2013 Aorus laptop, initializing the high-resolution display and logging hardware details. This M1 milestone demonstrates the critical importance of selecting the right toolchain for low-level system programming.