Computer security forensics firm ElcomSoft has found a $39 device - one Apple sells on its on website - that runs contrary to Apple's instructions, fooling the restricted mode and giving access to anyone using the device.
We performed several tests, and can now confirm that USB Restricted Mode is maintained through reboots, and persists software restores via Recovery mode.
Once you're done with that, open up Settings, and head to Touch ID & Passcode (or if you're on an iPhone X, you'll need Face ID & Passcode).
USB Restricted Mode is created to shut off access to data on an iPhone or iPad when new USB accessories are plugged into the Lightning port, as long as it's been more than an hour since you last unlocked your iPhone. This appears to be an oversight on Apple's part, which would allow authorities to gain access to iPhones by resetting USB Restricted Mode.
What ElcomSoft note is that any USB accessory can be plugged into the iOS device within the hour safe window, and this prevents the timeout from ever being reset. The $9 Lightning-to-audio-jack adapter doesn't work, but Apple's Lightning-to-USB-3.0 adapter does.
iOS 12 may be the hottest iPhone operating system you can run right now, but that's still in beta. As a result, the Lightning port can be kept accessible for an hour past the point of initial seizure by plugging in a Lightning accessory.
A growing number of iPhone and iPad owners have voiced their complaints on the official Apple support forums regarding a battery drain issue due to iOS 11.4. When you connect the iPhone to a computer, the two devices exchange cryptographic keys and establish trust.
A really interesting tidbit from the ElcomSoft report is that since iOS 11.4, Grayshift's boxes are already weakened significantly. Users can also manually enable USB Restricted Mode by triggering the SOS mode-holding an iPhone's sleep/wake button and either volume button. The only way for Apple to now fix this flaw would be to require authentication of all iPhone accessories, but this likely won't happen anytime soon.