Kirin 990's power management is tied to EMUI's kernel. On a custom ROM, you will experience random drain or overheating during video calls.
As of today, due to Huawei's locked bootloader policy on the Kirin 990 series, the common Android enthusiast cannot install a third-party ROM like LineageOS or a GSI on their P40 Pro. The crucial first step required for all such modifications is unavailable to the general public. Those who claim to have done so are typically using paid engineering services or have older, prototype devices.
To prevent boot loops, you must clear out the old operating system remnants: fastboot reboot fastboot (to enter userspace fastboot/fastbootd configuration) fastboot erase system Step 4: Flash the Custom ROM Image Custom Rom For Huawei P40 Pro
The Huawei P40 Pro (ELS-N39/ELS-N04) is a photography masterpiece, even in 2026. Its Kirin 990 5G chipset, Leica camera system, and stunning display still hold their own against modern flagships. However, the lack of native Google Mobile Services (GMS) and the aging EMUI/HarmonyOS interface can feel restrictive.
The bootloader is locked by default. Official unlock codes are no longer provided by Huawei, making standard flashing procedures nearly impossible for the average user. Kirin 990's power management is tied to EMUI's kernel
Banking apps, Google Pay, and certain games (like Pokémon GO) may refuse to run without complex Magisk bypasses.
Due to the well-documented U.S. trade sanctions, the P40 Pro ships without official Google Mobile Services (GMS), instead relying on Huawei Mobile Services (HMS) and the AppGallery. While this has improved over time, many users still desire the pure, unadulterated Android experience that custom ROMs provide. A custom ROM—like LineageOS or Pixel Experience—offers the freedom to strip away bloatware, unlock hidden developer features, optimize performance to the user's exact liking, and reclaim control over the device. The crucial first step required for all such
Alternatively, boot into the stock Huawei Recovery mode manually (hold Volume Up + Power) and select . Step 6: Reboot Your Device Type the final command to reboot your smartphone: fastboot reboot Use code with caution.
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