Modify CID

Modify CID by SDcard file
Input a file which file name is "cid" under /sdcard/.
Make sure the value of /sdcard/cid is a valid Carrier ID.
After reboot, it will prompt a dialog to ask changing CID.
(＊It prompts only when the value of /sdcard/cid is not same as current cid)
For example:
1、$adb shell "echo WW_____1 > /sdcard/cid"
2、$adb shell reboot
3、Click Yes button on the dialog
4、Factory Reset starts automatically, then everything is done.
Notice: The length of CID is always 8 characters.