Tried updating my iphone
If you don't have an old backup, you'll have to set up your device as new.
The process can take several hours to complete, depending on the speed of your machines and the amount of data.
Click the device's icon to open its summary page and hit 'Restore'.
(It's recommended that you back up your i OS device before restoring it, but it's not required.) Once the procedure is complete, i Tunes will ask if you want to restore from a previous backup.
(If there's nobody you can get a cable from, you could pop into an Apple store, or buy a new Lightning cable.) If you've given your i Phone or i Pad a decent charge using multiple plugs and cables but it still fails to display anything, you're probably looking at a hardware problem such as a degraded lithium battery.
Don't want to pay for a replacement, thrown in the towel or looking to get a new phone anyway?
Then you could always sell your i OS device on sites such as e Bay as 'parts or not working'.
Have you got an i Phone, i Pad or i Pod that refuses to turn on or appears to be 'bricked'?
There's a good chance that your i OS device is still fundamentally functional, but you just need to use some gentle persuasion to wake it up.