This ELRS Recovery Dongle is an FTDI USB to TTL module based on the CP2102 bridge controller, which is applied to the firmware upgrade for the ESP32&ESP8XX chip. The ExpressLRS Recovery Dongle is compatible with many ELRS receivers in the market and FPV goggles backpack. It will be a good choice to unbrick the ELRS receiver when failed in updating or flashing firmware by UART.