6.2.4.1
	1. To solve the problem of get the wrong group number with function "GetUserGroup" on TFT device.
	2. To solve the problem of uploading 50 thousands users in batch update mode.
	3. Updating the specification of function SetUserTZStr and GetUserTZStr.
	4. Adding group verification and personal verification to AccessControl Demo. Adding "normal open & normal close" function to B&W AccessControl Demo.
	5. Adding the specification of Attendance Photo function in TFT_SDK_Manual.

6.2.4.0
	1. To solve the problem of supporting "Hot Plug" in USBClient communication.

6.2.3.9 
	1. 64bit SDK is available.
