ERROR 48 SOLVED!!!!!
Updating my 4S to IOS 8.4 was not succesful. Recovery using Itunes gave an Error 48.
Only fools do things over and over again and expect a different outcome.
So there I was being a fool trying recovery after recovery as suddenly I had an idee.
In my opinion there are 3 main factors: the hardware, the software and the test to make sure everything is working properly.
Hardware suddenly broke during update? I don't think so.
Software not OK? Not likely as the same software is already on millions devices.
Test not OK? Probably!
As I noticed being a fool, the Iphone was preparing, installing and testing and just before finishing gave Error 48. So the next time I tried, after the installation was finished and testing was about to end, I simply pulled the connection cord with my macbook and thus with Itunes. Now the testsoftware in Itunes, couldn't tell my Iphone he was not OK and he started just like that and is working properly ever since.
In this case, the patient was sic just because the doctor told him he was.
Maybe, there is something somewhere not 100% Ok, but if I can make calls, read mail, surf the net, use whatever app I tried so far, it is just a perfect working Iphone to me.