Requires a specific downgrade to EMUI 10 followed by the "Googlefier" or "LZ Play" method.
The P40 Pro's Kirin chipset is notoriously difficult to recover if a flash goes wrong. Final Recommendation Custom Rom For Huawei P40 Pro
If you found this post useful, please consider donating to the OpenKirin Treble team – they keep Huawei devices alive against all odds. Requires a specific downgrade to EMUI 10 followed