The firmware for the True-D went through several major iterations. While it introduced innovative features for the time (such as the "Spectrum Analyzer"), the firmware is widely remembered within the FPV community for a specific "memory leak" bug that caused the module to freeze during use. Eventually, Furious FPV ceased firmware updates, leaving the module in a legacy state.
The update process varies significantly depending on the age of your module. These modules lack a USB port and require an FTDI adapter . furious fpv true-d firmware
Click . The module screen will go blank during the process. Deep Report: Furious FPV True-D Firmware The firmware