"I just updated my iPhone 5s to iOS 8 over Wi-Fi. In short, the update bricked my iPhone and put me in Restore mode. I had to reset to Factory Settings, which caused me to lose data that I hadn't backed up. I had a lot of important contacts on my iPhone address book; can I recover iPhone contacts on MacBook after iOS 8 update?"
Contacts are an essential part of your iPhone data and it forms your network. If your contacts are lost after updating iOS, the contacts are not gone for good. Maybe you could try the following solution which uses a third party program, iPhone Data Recovery for Mac, to recover iPhone contacts on Mac after upgrading iOS 9.3/9/8.2/8.1/8.
The iPhone Data Recovery for Mac tool is designed to help iPhone users retrieve lost contacts, text messages, photos, notes, etc. easily. As a lot of reasons could lead to iPhone data loss (iOS updates, jailbreak and factory reset, just to name a few), such a tool could come in handy. Good news for those who always forget to backup is that iPhone Data Recovery for Mac is capable of recovering data directly from your device without using backup files, so is iPhone Data Recovery, the Windows version. Get a copy of the free trial version and read on to see how to recover iPhone contacts on Mac after installing iOS 8.
You might have noticed that iPhone Data Recovery for Mac totally offered you with 3 recovery modes. The other 2 modes are for those who have iCloud or iTunes backup. To recover iPhone address book on Mac after iOS 8 update with other 2 modes, go to iPhone Data Recovery for Mac guide page for details.
You might worry about malicious use of your iPhone contacts, especially when your iPhone is lost. Besides the iPhone screen-lock, you could enable a feature in "Find My iPhone" that allows you to delete the iPhone contacts as well as other data once your iPhone is lost or stolen.
Additionally, you can sync iPhone contacts with Google and let Google keep the contacts for you. By doing this, even you have no backup and iPhone is stolen, you still have all the contacts with your reach.