IRIS Kit is an opensource module of IRIS with IR remote control emitter and receiver. It helps you to do the prototype verification of your smart hardware product.
To flash the official firmware, download the binary file from <a href="https://site.irext.net/sdk#download">SDK and Database</a>, and flash with <a href= "https://www.espressif.com.cn/sites/default/files/tools/flash_download_tool_3.9.5.zip">Espressif Download Flash Tool</a>.