When upgrading ELRS receivers, there are primarily two options: Wi-Fi and Serial Port. While Wi-Fi upgrading is very user-friendly and doesn’t require additional accessories, it can be susceptible to failures caused by unstable networks.For a more reliable and professional upgrade experience, RadioMaster ExpressLRS UART Flasher is your solution. This dongle is designed specifically for ELRS receiver serial port upgrades, providing a dependable and professional solution for flashing or recovering receivers with a bad flash.FeaturesEquipped with multiple protective circuits, including overcurrent and reverse protectionOptionable 3.3V and 5V output voltageStandard 2.54mm pinsRM-CRSF JST-GH interface output for versatile connectivity with compatible ER series receiversFeaturing a spring-loaded pin socket for enhanced convenienceComes with DuPont wires for easy testingCompatible ReceiversUsing 2.54mm pin output and spring-loaded pin adapter or Test hook adapters:All RP SERIES ELRS RECEIVERSUsing regular 2.54mm pin output (Servo plugs):ER3C-i 2.4GHz ELRS PWM ReceiverER5C-i 2.4GHz ELRS PWM ReceiverER4 2.4GHz ELRS PWM ReceiverER5A 2.4GHz PWM ReceiverER5A V2 2.4GHz PWM ReceiverER5C 2.4GHz PWM ReceiverER5C V2 2.4GHz PWM ReceiverER6G & ER6GV ELRS PWM ReceiverPlease note: The second channel is repurposed as a serial TX, connected to the RX port of the serial port tool. The third channel is repurposed as RX, connected to the TX port of the serial port tool.Firmware upgraded by RM-CRSF interface output:ER6 2.4GHz ELRS PWM ReceiverER8 2.4GHz ELRS PWM ReceiverER8G & ER8GV ELRS PWM ReceiverPlease note: The above receivers can be connected to the receiver’s CRSF port by using a 4-wire CRSF cable.How to upgrade firmware1. Connect the Serial Port Cable with receiver 2. Press the receiver’s BOOT button, and insert the serial port tool into your computer 3. Follow the ELRS upgrade tool’s instructions to complete the upgradeDownloadUSB to UART driverUSB UART Tool Connection GuideSizePackage Includes1 * RadioMaster ExpressLRS USB Uart Flashing Tool1 * Pogo Probe1 * 1.25mm Serial Port Cable – Type A1 * 2.54mm Serial Port Cable – Type B1 * Serial Port Test Hook – White1 * Serial Port Test Hook – Green1 * Serial Port Test Hook – Red1 * Serial Port Test Hook – Black1 * User Card
