Flash Jetson nano

I have Ubuntu desktop with Nvidia sdk manager and its not recognising the board, Please assist how do i flash this board, do i need to plug a jumper somewhere?

Yes.If you are using our jetson nano sub kit.
Please refer to our wiki:Firmware update | youyeetoo wiki

Hardware configuration (enter recovery mode)

  1. Short-circuit the FC REC and GND pins with a jumper cap or a Dupont wire, the position is as shown below, under the core board.
  2. Connect the Micro USB interface of Jetson Nano to the Ubuntu host with a USB cable (note that it is a data cable.
  3. Connect the DC power supply to the circular power supply port, and wait for a while.