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iBoot to mBoot — Apple’s iPhone bootloader has a mysterious new name

The iOS bootloader just got its first name change, from ‘iBoot’ to ‘mBoot.’ As to why, nobody outside of Apple Park knows yet.

An iPhone on a table, with code on-screen.
The second iOS 26.4 developer beta renames the iOS bootloader.

While the second iOS 26.4 developer beta makes it possible to test end-to-end encrypted RCS texting with Android devices, the software contains another, more mysterious change.

Apple has altered the long-standing name of the iOS bootloader. This is the first change since when the operating system debuted nearly two decades ago.

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