Local iOS Backups Repeatedly Prompt for Passcode.If Apple is not retiring this feature, it should be possible to see if an iPhone has Wi-Fi syncing enabled on the phone itself. The only way to know if an iPhone has Wi-Fi syncing turned on is by checking in Finder on the trusted Mac, or in iTunes on a Windows PC. That information does little to ameliorate these abuses, however. It is also not new - the vulnerabilities of Wi-Fi syncing have been known since at least 2018. However, in iOS 13 and all subsequent updates, Apple has removed this information from the Settings app, making it extremely difficult to tell if it is enabled. It would even display the name of the computer that your iOS device was set up to sync with. Historically you could perform a simple check in the Settings app on the phone to see if WiFi Sync was enabled (and therefore if you may be a victim of this type of spyware). As far as the phone is concerned, it is just performing a routine backup. Nothing needs to be installed onto the phone itself, which makes it very difficult to detect. An application on the computer then reads the backup and packages up all the information into a clear report for the stalker. The solution offered by spyware providers requires the stalker to have access to their target device to set the connection up, but after that the target device will provide a full backup to a computer using the same WiFi network. Unfortunately, this ease of set up and lack of maintenance makes it the perfect target for spyware providers and cyberstalkers. There is a little-known feature on all iOS devices called ‘WiFi Sync’, which essentially allows for a backup of the device to regularly be downloaded onto a nearby computer over a WiFi connection. I think there used to be an option to “Erase and install,” which I surely would have chosen in a situation like this where I was trying to create a clean system for testing, but with no such option presented that possibility was not top of mind. After I erased it with Disk Utility, the installation proceeded normally. I eventually figured out that the destination volume, though it looked empty, contained the remnants of something. But setting the Mac’s clock back didn’t help, and neither did downloading a fresh copy of the installer. It may have been corrupted or tampered with during downloading” error, which indicates an expired certificate. At first, I thought it was another variant of the “This copy of the Install OS X El Capitan application can’t be verified. I was recently setting up a High Sierra test partition, and this error popped up after the installer had rebooted the Mac to complete the installation. “Volume contains a macOS or OS X installation which may be damaged”
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