When the TC44C dongle works with an iPhone, if the prompt “”Cannot Use Accessory. Bravo HD FW Update: This accessory requires too much power.” appears, it means the TC44C cannot be correctly recognized by iPhone, and please try to upgrade the fimrware of the TC44C dongle. Here is how to upgrade the firmware of the TC44C dongle: 1. Please connect the TC44C with the Windows computer by the suitable USB cable or adapter firstly, then double click to open the file “Firmware upgrade tool for TC44C.exe”. Figure 1 2. (1) Please click the button “…” and select the firmware file…