....went to Apple store today explaining to them what had happened with my daughters phone during 7.1 install.
Also pointed out that phone was a 'refurb' model, purchased in December, with 90 days warranty, from an internet company. I was not looking for a replacement, I was merely wanting the device to be restored to the 7.0.6 version of IOS as it worked perfectly on this.
I was informed that the device must be faulty and restore to an earlier IOS this was not possible. (There are various reports on the net about the versions of IOS which can be restored as far back as 6.1.3 for the iphone 4s, but apparrantly 7.1 has been designed to prevent this.)
Apple Assistent offered replacement at £159 but wanted to look inside the phone to confirm a serial number. She then withdrew offer once she confirmed there was 'after market' parts fitted inside the phone. ( ....I did tell her it was a refurb....) I told her I was not happy that the update had made the phone useless and if similar was done on a PC, you could at least restore the system to an earlier setting.
This did not cut any ice with the apple assistant. It is my view that this new update (7.1) is not only to kill off 'jail-breaking', but to disable any devices with non genuine parts.
One further enhancement of 7.1, if you had selected 'find my phone' to be switched on whilst using an earlier version of IOS, then the latest update (7.1) locks it out from being reactivated by somebody else .....possibly the reason why I couldn't reactivate the phone on the single occasion when I actually managed to get the update to install.
The learning lessons for me? I should not have bought an Apple device with 'crappy' parts in it because Apple wants me to suffer all I deserve for doing so. Also, I should not buy any other Apple devices into the future because Apple does not want me to be able to restore any device which has a failed install on an update. I cannot prove that the update destroyed my 12 year old daughter's 'fake' phone (description used by Apple Assistant) because I cannot check to see if it still works on an earlier version of IOS....thank you Apple, you have it all sewn up.