Hongmeng version 3.0 is good. According to a search of Huawei's official mobile phone website, the Hongmeng 3.0 system focuses on ecologicalization and multi-device collaboration, which is a key step for Huawei to build a "full-scenario smart life". Version 3.0 has a more complete distributed technology architecture and richer open interfaces and functional modules. Version 3.0 also supports a wider range of devices and scenarios, including smart home, smart travel, and smart medical care. It is better to use Hongmeng version 3.0 for nova4.