I installed ios7 on a pretty old iPhone (2009 I think). The phone is now slow with awful battery life. Does anyone know how to downgrade? Many thanks in advance.
You need to save your blobs to do that, and most people don't even know that they can do that. I was assuming that on a thread where the OP did no research whatsoever before upgrading their device, the OP probably didn't save their blobs.