Lineage noteHarmonyOS and EMUI are related, but not a simple rename
Huawei introduced HarmonyOS 1.0 for smart-screen deployment before the large phone migration. HarmonyOS 2 then expanded to smartphones and explicitly compared its experience with the previous EMUI generation. Huawei also maintains a separate global EMUI product page, so the transition should not be reduced to a universal one-step rename.
Release historyHarmonyOS 1
Huawei introduced HarmonyOS as a distributed operating system and identified smart screens as its first deployment category.
Release historyHarmonyOS 2
HarmonyOS 2 marked Huawei's large-scale expansion to smartphones, tablets, watches, and other connected products in China.