uBITX is based on Arduino Nano. So uBITX's firmware upgrade method is the same as Arduino. There are two ways to upgrade the firmware of uBITX. The first is to compile the source from the Arduino IDE, and the second is to upload the compiled hex file using the Firmware Upgrade Tool. I'll show you how to upload a compiled hex file as a second method. 1.Connect the uBITX's USB cable to the computer. 2.Run Device Manager on your computer. The way to open the Device Manager for each OS Version differs slightly. In most Windows, you can easily launch the Device Manager by running. On your computer, press the Windows key + R. Type devmgmt.msc and press OK Button. On most operating systems, there will be a serial port named Ports with CH340. If so, the next step is skipped. If the serial port is not installed as below, you need to install the driver. Included in uBITX is the Adonano, which uses the CH340 USB To UART part. Download the latest