Apple iPad can't install HarmonyOS (HarmonyOS). HarmonyOS is an operating system developed by Huawei and designed to run on Huawei's smart devices, including smartphones, tablets, smartwatches, and many more IoT devices. While HarmonyOS is designed to support multiple device types, it is primarily optimized for Huawei's own hardware products and ecosystem.
Apple's iPad runs Apple's self-developed iPadOS, which is an operating system based on iOS that is optimized for the iPad's large screen and features. Apple's operating system and hardware are tightly integrated, providing some specific features and optimizations, which also means that installing non-Apple-supported operating systems on iPad hardware will face significant technical hurdles and limitations. In addition, attempting to install or run an unauthorized operating system on an iPad may violate Apple's terms of use, void the device warranty, and may encounter legal risks.
From a technical point of view, making an operating system like HarmonyOS run on completely different hardware like an iPad requires addressing a huge number of driver, hardware compatibility, and security issues. Even with sufficient technical capabilities and resources, without official support, there is a high probability that such a project will fail, or at least not provide a good user experience.
So, if you are interested in HarmonyOS , it is recommended to experience it on Huawei devices that support HarmonyOS OS. Trying to install HarmonyOS on your iPad or other non-Huawei devices is not a viable or recommended option at the moment.