Hi @Jli - you just download the Chinese Simplified NWT in EPUB format. The Equipd Bible app can then add the Pinyin above the Chinese characters automatically. This is actually covered in the Knowledge Base here: http://www.equipd.me/forums/threads/install-new-bibles.51/ And that article also links to a video tutorial that includes how to install and setup the Chinese Pinyin NWT Bible in the app. Hope that helps.
Further to this, here is a short screencast showing how to get the NWT working in Chinese Simplified with Pinyin: https://cl.ly/3e0X2U0d2q2Y