The document you can download in the RAK Document Center: http:https://www.rakwireless.com/en/download/RAK813%20BreakBoard/Software%20Development

• Navigate to Nordic official website or RAK Data Center
• Download and install the tool
  
  

• Navigate to https://www.segger.com/downloads/jlink
• Click “Click for downloads” under “J-Link Software and Documentation Pack”
  
  
• Download the appropriate package for your OS
• Accept the License Agreement
• Run the installation program with default configurations

• Connect the j-link and RAK813 BreakBoard
  
  
• Open the nRFgo Stdio, Select the "nRF5X Programming"
  
  
• "Erase all", and Select the "Program SoftDevice"
  
  
• Select the ../nRF_Lib/components/softdevice/s132/hex/s132_nrf52_5.0.0_softdevice.hex file,and then "Program",Waiting for a while will prompt programming success
  
  

• Navigate to http:https://www.keil.com/
• Download and install the Keil5
• Download the ../Keil5/NordicSemiconductor.nRF_DeviceFamilyPack.8.14.1.pack ,Installed nRF52832 compiler environment for Keil5
• Use Keil5 to Open the ../Keil5/rak813_breakboard.uvprojx file,Now you can start writing your own program
• Click on the top left corner to "Buide",Click on the top left corner to "Download"
  
  

• Navigate to https://www.iar.com/
• Download and install the IAR (Note:the best version is 8.11)
• Use IAR to Open the ../IAR8.11/rak813_breakboard.eww file,Now you can start writing your own program, Click on the above to "Make"
  
  
• Click "Project"->"Download"->"Download Activities Application" to download