IOS 7 ugrade failed " Error:Device disappeared during timed transition". Phone will not now turn on or sync with itunes, any ideas please?

iOS 7 ugrade failed " Error:Device disappeared during timed transition". Phone will not now turn on or sync with itunes, any ideas please?

if a Mac OSX Computer is in near - try iBackup Viewer.
This is free of charge and can read your backup.
and thats the main difference. Those tools are reading the saved Data in the backup
but itunes attempts to restore the data from the backup on your iphone. if there are any corrupted data in the backup - the backup restore goes wrong. this can happen during security software or wrong corrupt data already stored on the iphone.
if itunes messed up to restore from backup try this one :
- restore your iphone to factory settings using HT1808 or reset all settings and content direct from iphone
- rename your iPhone (e.g. iPhone Test)
- setup your iPhone as new device -> attempt to make a new backup - if successful -
- click in itunes on restore from backup... and choose your desired backup
or go to:
Mac: ~/Library/Application Support/MobileSync/Backup/
Windows XP: \Documents and Settings\(Username)\Application Data\Apple Computer\MobileSync\Backup\
Windows Vista - Windows 7: \Users\(Username)\AppData\Roaming\Apple Computer\MobileSync\Backup\
Pull your complete BackupFolder and try a different PC - copy the BackupFolder on this different PC in the same Path above - start iTunes and see if your Backup is there - attempt to restore from Backup again

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