One of the tools any good flashaholic should be familiar with is fastboot. Like ADB, the help screen for fastboot received some changes with the preview release of Android M. The reboot command now offers a friendlier syntax to reach the bootloader, and there is a new set of "flashing" commands designed to prevent write operations from occurring when they aren't desired. There's also a fix for the "missing system.img" error that some people experienced after trying to use the flash-all script to install factory images.
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