Huawei has started rolling out the March 2020 security patch to the Huawei P20 and Huawei P20 Pro. It comes with the software version EMUI 9.1.0.387/EMUI 9.1.0.388.
EMUI 10.1: Latest News, Rollout Date, Eligible Devices, and Features
Huawei P20 and P20 Pro receiving March 2020 EMUI security including Google security patches and fixes for 2 critical and 20 high levels of Common Vulnerabilities and Exposures (CVE).
However, there are no additional optimizations mentioned in the changelog.
EMUI VERSIONS:
Huawei P20 and P20 Pro receiving March 2020 security update with EMUI 9.1.0.387.
Note: This update is rolling out in batches and the EMUI version and size may vary depending on the region/country.