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Clarified version 2, without significant functional changes. [47] 2007 3 Added 1 Mbit/s Fast-mode plus (Fm+) (using 20 mA drivers), and a device ID mechanism. [48] 2012 4 Added 5 Mbit/s Ultra Fast-mode (UFm) for new USDA (data) and USCL (clock) lines using push-pull logic without pull-up resistors, and added an assigned manufacturer ID table.
With these changes, Google can add new system functions and update apps without having to distribute an upgrade to the operating system itself. [183] As a result, Android 4.2 and 4.3 "Jelly Bean" contained relatively fewer user-facing changes, focusing more on minor changes and platform improvements. [184]