I'm trying to increase the batter life on my 2G iPhone, which is currently getting about four hours of usage per charge. Somewhere, I read to make sure that you restore in DFU mode. I had restored without putting the phone into DFU mode and am now restoring if after putting it in DFU mode. My question is whether putting the phone in DFU before a restore should make a difference and, if yes, why? Thanks!