I borrowed an old charger from my friend for my 2G iPhone as my charging cable ceased to work. I don’t know the manufacturer because it’s pretty old and the stickers off. I also have 3G iphone with me and when I tried charging it, it says “Charging is not supported on this accessory”. Is there any way I can make the charger work? Any suggestion? I need to get this fixed as soon as possible. Thank you.