HTC M9 Android 7.1 LineageOS 14.1

請問版大
本身我的是沒有s-off的，但已解鎖
也有將boot.img檔案放入adb資料夾中
鍵入fastboot flash boot boot.img
顯示了以下，這樣是有成功嗎將boot.img刷入嗎??

C:adb>fastboot flash boot boot.img
target reported max download size of 536870912 bytes
sending "boot" (33532 KB)...
OKAY [  1.136s]
writing "boot"...
FAILED (remote: cannot flash this partition in s-on state)
finished. total time: 1.165s