If you decide to proceed with flashing a ROM, you must prepare the following elements:

If you need to recover or reinstall stock firmware, use or HiSuite . Avoid custom ROMs unless you are prepared to lose functionality and have unlocked the bootloader via paid third-party methods.

You must clear the existing EMUI data encryption. In Fastboot, run: fastboot erase userdata fastboot erase cache Step 4: Flash the GSI ROM

: Unlocking the bootloader and flashing a ROM will completely wipe your internal storage. Step-by-Step GSI Installation Guide

In 2026, the Huawei Mate 20 Pro software experience varies between global EMUI 12/13, which has largely ceased updates, and Chinese units running HarmonyOS 4.0 or higher. While custom ROMs and Generic System Images (GSIs) allow for newer Android versions, they require third-party bootloader unlocking and may impact hardware functionality. For more details on recent updates, visit Huawei Central

In-screen fingerprint sensor and 40W SuperCharge may not work correctly. 4. Is the Mate 20 Pro Still Worth Using in 2026?

: The 128 GB ROM model is usually paired with 6 GB of RAM , while the 256 GB version can come with 8 GB of RAM .

The Ultimate Guide to Huawei Mate 20 Pro ROMs: Revive Your Flagship

As of 2025, developers on and 4PDA are experimenting with Android 14 GSI on the Mate 20 Pro. The main limitation remains the proprietary HiSilicon drivers. However, the TrebleDroid project has successfully booted AOSP 14 on Kirin 980 devices.