"After a software update was sent to your lock, it failed to reconnect to our web service making a remote fix impossible." Owners have two choices.They can either remove the back panel of the lock and send it in to the manufacturer so the software can be manually updated, which will take between five and seven working days.Changes to firmware endure even after reboots, reimaging and complete OS removal, providing a consistent experience for users but also opening a significant attack avenue for malicious actors.

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The crashed locks – which connect to your home Wi-Fi for remote control and monitoring as well as firmware updates – are now going to be out of action for at least a week.

"Your lock is among a small subset of locks that had a fatal error rendering it inoperable," the locksmiths said in an email sent to affected customers.

It comes with a tool that automatically validates Mac firmware every week.

This won’t check whether the EFI version is up to date, but it will discover if the firmware has been compromised.

What’s the root of this piecemeal protection, and how can users stay safe?

Firmware exists below the Mac OS and hypervisors but on top of hardware.

Specific cases are even worse, with 43 percent of 21.5-inch i Macs from late 2015 showing an Apple firmware mismatch.