Yifanlu: In order to get fastboot working on most Android Devices you must restart it and hold a certain physical button to send the device into "bootlooder" or "recovery" mode. The K4 will have to support a similar feature in order to get Fastboot working. There are also tools similar to fastboot made by Nvidia for the Tegra SoC line called NVFlash, the point is that flashing partitions requires the SBK key which is very hard to come by, the first few device's sbk values were leaked in developer versions of the software. Maybe Amazon implemented a similar feature? I hope not, surely it can't be as easy as fastboot though.
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