To see the full flashing tutorial, read the following blog (Traditional Chinese only)
http://imuslab.com/wordpress/2021/04/12/sinilink-xy-wf5v-%E7%81%8C-home-dynamic-v2-iot-%E6%8E%A7%E5%88%B6%E5%99%A8/
Required IoT Hub with ArozOS 1.112 or above