华为产品技术文档多为hdx格式，必须使用华为提供的HedEx_Lite工具才能读取，所以读取产品文档前需下载安装HedEx_Lite工具。(HUAWEI's product technical documents are mostly HDX format. They must be read by HUAWEI's HedEx_Lite tools. Therefore, HedEx_Lite tools need to be downloaded before reading product