The ATmega32u4 has 32 KB (with 4 KB used for the bootloader).
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Instead of allowing Ubuntu to ride shotgun with Android, the installer requires unlocking the device's bootloader, which wipes the slate clean.
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Known as Nexus Root Toolkit, the program can be used to easily unlock and root Nexus devices, and can also return them to stock and re-lock the bootloader.
It could be argued that HTC serves the enthusiast market just fine with its bootloader unlock service, which gives users the ability to load custom ROMs onto their phones.
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As the folk at XDA know only too well, this particular iteration of Sammy's flagship comes with a sealed bootloader, which makes it resistant (though not impervious) to hackery.
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Starting with the Photon Q 4G LTE's August launch, owners will have the option to unlock the bootloader of at least some devices in an official way that reportedly keeps carriers satisfied.
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Google isn't officially declaring this a Nexus device (not yet, at least), but the GS4 at least exhibits many of the same qualities, including an unlocked bootloader and the promise of prompt system updates.
Custom ROM fans were briefly teased with the prospect of Verizon loosening its anti-modding stance when the HTC Droid DNA first arrived: in the pre-release days, the official HTCDev portal allowed unlocking the DNA's bootloader.
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To call this a risky procedure would be an understatement, however -- venturing past a certain point raises the real possibility of bricking the device, and HTC's bootloader tool already puts limits on post-unlock support even when it's blessed by carriers.
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For developer and custom ROM enthusiasts, DROID RAZR M and DROID RAZR HD will come in a special developer edition available online only through motorola.com in the U.S. Tweak, tinker and customize the day away by using Motorola's software tools to unlock the bootloader.
Of course, Sammy has nothing to gain from snubbing the modding community in this way, so it stands to reason that VZW pushed the Korean manufacturer to supply them with a locked bootloader -- despite the fact that all other variants have been left open.
ENGADGET: Verizon Galaxy S III has locked bootloader (but it's been rooted anyway)
Based on Samsung's hacker-friendly track record, you'd generally expect one of it smartphones to come with an unlocked bootloader, making it easy to update or tweak with unofficial ROMs. That's not the case with Verizon's imminent version of the Galaxy S III, however.
ENGADGET: Verizon Galaxy S III has locked bootloader (but it's been rooted anyway)
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