Xiaomi announced MIUI 12 at the end of April and since then it has been regularly releasing beta versions and stable builds of the new shell for its smartphones. Now it’s the turn of the Xiaomi Mi 8 SE and Redmi 9, which received the stable MIUI 12.

Xiaomi launched the Mi 8 SE in May 2018 in China. Smartphones remain exclusive to the company’s home country. It debuted with MIUI 9.5 based on Android Oreo and was later updated to MIUI 10 and MIUI 11.
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https://www.igeekphone.com/xiaomi-mi-8-se-and-redmi-9-started-receiving-miui-12-stable/