华为Q21，原来也是不知道怎么刷成Nas，前两天要刷成0712版，发现线刷完后启动停在以下信息：
mmc0: MAN_BKOPS_EN bit is not set
unfound correct edge! check your config is correct!!
unfound correct edge! check your config is correct!!
No valid phase shift! use default
mmc0: tuning execution failed
mmc0: error -1 whilst initialising MMC card
mmc0: MAN_BKOPS_EN bit is not set
random: nonblocking pool is initialized
unfound correct edge! check your config is correct!!
unfound correct edge! check your config is correct!!
No valid phase shift! use default
mmc0: tuning execution failed
mmc0: error -1 whilst initialising MMC card
ALSA device list:
No soundcards found.
Waiting for root device /dev/mmcblk0p6...
后来试着换fastboot，内核；一直换到0302的才能正常启动，原因不明，希望有大牛解惑，也希望能帮到有同样遭遇的朋友！
