V4.2
1.Capable of SIM5215/SIM5216 new nand flash
2.Auto adjust port number, if the port change when we upgrade module

V4.1
1.Provide the feature of upgrading only on downlown mode
2.Maybe qdn file backup and restore unsuccessfully, because the ATI info not enough

V4.0
1.Provide the Support to SIM6216 module upgrade
2.Modify the UI layout
3.Fixed the issue about memory error which cause upgrading stop

V3.0
1.Modify some bugs.
2.Get SW version by ATI command instead of SIMCOMATI command of the old version, because SIMCOMATI command is not supported by the old version.

V2.0
1.Modify the UI layout. 
2.Only support upgrading one module, and QDL.EXE can be opened once.
3.Auto detect the current valid port to upgrade.And also use AT port to get version and IMEI info, so before open QDL.exe, AT port and Diagnostic port must not be used by other applications. 
4.Image path will be detected whether it is valid, if image path is changed. After QDL.exe initial done, image path will be set to the current directory automatically. For SIM5218, the new module with HW info, the image path will be set to the "H2" folder. For the old module, the image path will be set to the "H1" folder. If you can't recognize which hw version your module is, and if you upgrade failed, please changed the folder "H1" and "H2" to try again.
5.After upgrade successful, there will be a messagebox to tell upgrade successful from which old version to which new version.

V1.0
1.The first version designed in MFC.
2.Product support:
	SIM5218/SIM5220/SIM5215/SIM5216/SIM5320/SIM6216
