Get into fastboot mode ??

[acc0101]

Hi all.

I tried to get into fastboot mode and check the bootloader state via adb.

I used the adb cmd "reboot fastboot", to reboot the phone and it shows up " entering the fastboot mode..." in a second , then it jump to the normal boot up again. Seems i cannot get in the fastboot mode.

Is it because i still haven't get the approve form in-depth test app, and that's why i cannot enter the fastboot mode??