追記
fastboot oem lockするとgoogleのロゴまで出るけどそれから動きません

C:\Users\Owner>fastboot oem lock
...
(bootloader) Start Verify: 0
(bootloader) [hboot query] query 24 is not implemented
(bootloader) [hboot query] query 24 is not implemented
(bootloader) Start Verify: 0
(bootloader) [hboot query] query 24 is not implemented
(bootloader) [hboot query] query 24 is not implemented
(bootloader) Lock device successfully!
OKAY [ 0.609s]
finished. total time: 0.609s