To me, it seems that you are flashing the boot.img into system partition

It should read:
fastboot flash boot boot.img

gibbs.shih wrote:
4. fastboot flash system system boot.img --> and then, reboot , android boot failure

Hello, I want to use the OTA features of Android to update the system. But I cannot enter recovery mode. The system gets into a constant boot loop, also with the default Android image provided by FriendlyARM. The problem seems to be the SELinux fail, which leads to a reboot to recovery mode. But as ...