Joke Collection Website - Public benefit messages - Why can’t I restore the contacts that I backed up in iPhone 91?

Why can’t I restore the contacts that I backed up in iPhone 91?

1. Quick backup of contacts. In fact, there is no need to synchronize contacts with iTunes every time. The best backup method is to save the two files in the directories /private/var/mobile/Library/AddressBook (version 1.1.4) and /var/root/Library/AddressBook/ (version 1.1.2) to your PC. To restore the firmware, you only need to put these two files back to their original positions, replace the files that come with the system, and restart the phone to restore contacts.