Developing a for the Huawei P40 Pro is restricted because Huawei officially terminated its bootloader unlock code service in 2018 . Without an unlocked bootloader, standard custom ROMs (like LineageOS or Pixel Experience) cannot be natively flashed or developed by the community.
A modern, less invasive alternative that allows many Google apps and notifications to work on newer EMUI or HarmonyOS builds without full system modification. Huawei P40 Pro in 2025 (harmony os, google, etc) Custom Rom For Huawei P40 Pro