iTunes cannot read the contents of the iPhone

Wife's iPhone 6s 16GB bricked on trying to update to iOS 13.1 using iTunes on Windows 10 PC (64-bit OS). Luckily iTunes made a backup that I was able to restore on brand new iPhone 11 Pro Max. However now whenever I connect the iPhone to the same PC it cannot read the contents of the iPhone and prompts to restore to factory settings.

Things I've tried: rebooting iPhone, un-installing/ re-installing iTunes, updating drivers Apple USB device in Windows Device Manager, tried other PC, swapped cables... Nothing works! Have made a new backup, saved in iCloud, but worried if I do restore that my wife's data and settings will be compromised.

Have a suspicion that the 3rd party software I used to copy files from the iPhone, by Xilisoft, has corrupted something in the iOS. Anyone have any ideas how I can get my iPhone to be read by iTunes?