The documentation is mainly in Chinese. Essential parts in English, but still, Google translate was my best friend. And a lot of guesswork ... After some firmware fixes by Sunrise it works flawless via MMDVM hotspots and repeaters connected to the international Hamradio Brandmeister Master network. Built a complete transceiver unit based on the module. Added external audio and ESP32 based MPU + Nextion display. Recommend Sunrise to translate the documentation into English and add missing information to clarify how-to.