https://xiaomi.eu/community/threads/9-8-29-9-9-3-9-9-6-last-miui-10.52036/
Hey Redmi K20 pro users, check this weekly miui rom.
This update includes Widevine L1 for MI9, HMK20, HMK20Pro, HMNote7, HMNote7Pro .
Haven't flashed it, but believe it's true!