iPhone error 48 is an error that usually occurs during a restore via iTunes when the IPSW file extension is corrupted. The error has also been reported when attempting to backup or update the device. Users may end up getting stuck in recovery mode when this error occurs.
Possible reasons for this error include an anti-virus blocking iTunes, hardware problems, or iTunes issues.
The error may appear as "Error -48 iTunes unable to download your update at this time. Check network connection or settings."
Some of the solutions to this error include deleting the IPSW file extension and repairing the hardware.
Please see our in-depth walk-through solutions below.
For OS X
iPhone error 48 may also occur due to a faulty mainboard component, such as U12_RF or the baseband chip. To confirm that, try to run a Device Firmware Update (DFU) at least five times, it could only be a bad firmware. If DFU did nothing to fix error 48, it is better to send this to the Apple service center for warranty claims. However, if your phone is out of warranty, a cellphone repair shop with chip level repair skills could repair this type of problem.