P1 will not connect to firmware, no green and blue lights, have slow flash on model of RED then GREEN, motors spin up and can be controlled to full power and down again. Was wondering if I have a problem with the compass on the leg. Changed USB cable and no problem, work with other models, have uninstalled and reinstalled firmware about 3 times, no connection on Win 8.1 or Win7. Hoping it not the GPS module or compass. The model will fly, but because of light flashing not taking the chance of any long distance or height flying,( hovered in back garden). Any ideas please.