Z2以解鎖無法刷入TWRP

我的Z2已經解鎖了
要用FASTBOOT刷入TWRP

C:\Program Files (x86)\Minimal ADB and Fastboot>fastboot flash boot C:\twrp.img
< waiting for any device >
target didn't report max-download-size
sending 'boot' (12296 KB)...
OKAY [ 0.655s]
writing 'boot'...
OKAY [ 0.836s]
finished. total time: 1.499s

有成功刷進去
但開機後 TWRP燈沒亮 按音量減也沒用
求救各位神人!!