Hey so here's my problem. I've got a jailbroken iPhone 3GS which was gifted to me last week by my elder sister. It has ios 4.1 but when i try to update it to ios 5.0.1 it says firmware not compatible. In iTunes it says you can only update till iOS 4.2. But my friends iPhone 3G run iOS 5.0.1. I don't have any SHSH files saved.. Please help me...I want to update it..Help will be appreciated.