ExpressLRS supports both 900 MHz and 2.4 GHz hardware options. ExpressLRS uses LoRa modulation at all packet rates to achieve the best possible range and consistency of packet delivery. ExpressLRS can be flashed into existing Frsky R9M hardware (RX and TX

first r9m_elrs_bl.frk is copied to the radio and flashed with the normal "Flash external module" method. the stock BL will install this new bootloader @ 0x08002000. then, build Frsky_TX_R9M_via_stock_BL and copy the result (firmware.elrs) to the

Quote:ExpressLRS is an open source RC link for RC aircraft. It is based on SX127x hardware combined with an ESP8285 , ESP32 or STM32 for RX and TX respectively. ExpressLRS can be flashed into existing Frsky R9M hardware (RX and TX) or custom PCBs can be m