Make sure you can access the reset and boot buttons at the back of the Pipo board (If your pipo has a casing, you have to open its back cover (remove the screws and carefully remnove the cover. You do not need to remove the board from the case). Be carefull not to pull on the battery cables. You can leave the battery plugged for this procedure)
Connect Pipo to your computer with a USB cable (make sure it is not a "charge-only" cable)
Then select below which type of Pipo you are updating
Click Upload below
When prompted to select a serial port, select "USB JTAG ... " (If not present, double check or replace your usb cable and repeat the steps to put Pipo in upload mode and try again. There is no driver needed for Pipo)
You should then be prompted to choose to install Pipo. Continue with installation.
After the installation is done, reset your Pipo (either by clicking reset button or switch it off then on)
That's all !
You can close you Pipo. Be carefull to properly position the battery and not to pinch the battery cable between the case and the cover.