Answer: This model left the factory running mobile platform 9 (API 28) and received official upgrades to platform 10 (API 29); for platform 11 or newer you will need a community-maintained build such as LineageOS 18.1/19.0. Keep official MIUI releases if you require the highest stability and DRM support; choose a reputable custom ROM only if you accept unlocked-bootloader trade-offs. Check the current system on-device via Settings → About phone → System update (inspect the MIUI build and system...