C:\ADB-Windows>adb reboot bootloader
adb server is out of date. killing...
* daemon started successfully *
C:\ADB-Windows>fastboot oem readcid
... INFOcid: HTC__031
OKAY [ 0.027s]
finished. total time: 0.028s
C:\ADB-Windows>fastboot oem writecid 11111111
... INFOcid: 11111111
OKAY [ 0.014s]
finished. total time: 0.014s
C:\ADB-Windows>fastboot oem readcid
... INFOcid: 11111111
OKAY [ 0.008s]
finished. total time: 0.008s