It is likely based on the Android 10 kernel (hence the "10" in the name), as HarmonyOS 2.0 was built upon the Android Open Source Project (AOSP) base for smartphones. Ibm Storwize V7000 Initialization Tool Download - 3.79.94.248
Here is a full write-up regarding Xtreme LiteOS 10 v3. 1. Overview Xtreme LiteOS 10 v3 is a custom ROM developed by independent developers (often found on platforms like XDA Developers or 4PDA) targeting Huawei and Honor devices. It is designed to bring a "Lite" experience to the device, stripping away heavy system processes and unnecessary applications to improve speed and battery life. Sin Censura Top | Modaete Yo 09 Adam Kun
However, it requires technical knowledge to install and is not recommended for users who rely strictly on apps that require an unmodified, SafetyNet-passing device (though Magisk can often fix this). It is a "Full" experience in terms of features, but a "Lite" experience in terms of resource usage.
Based on the typical naming conventions in the custom Android ROM community, refers to a custom firmware modification of HarmonyOS (specifically version 2.0 or 2.1) designed for older Huawei and Honor devices that did not officially receive the update, or for users looking for a debloated, performance-oriented experience.