Connect the two ribbon cables for the USB connector and the battery to the mainboard

Press the Power button to test that the device starts correctly. Note: You'll have to directly press the small button on the left hand side of the mainboard to power up the device

Connect the device to a USB charger, to test that the device charges correctly

Note : GPS might not work at this stage. If you want to try it out, make sure the 4 pins on PCB are in contact with the the 4 bottom traces by pressing the two halves together firmly. Go under a clear sky.