CC31xx/CC32xx ServicePack

请问各位大拿，

TI的CC31xx/CC32xx ServicePack 提供什么功能，为什么需要先烧写这个image？  谢谢！

http://processors.wiki.ti.com/index.php/CC31xx_%26_CC32xx_UniFlash#Service_Pack_Programing

Service pack is a common name for the image required for updating the device (either upgrade or downgrade the device). The service pack is a single file containing images for all flavors of the device, regardless if it is CC3100/CC3200 or ROM/Flash device. The detection is done automatically by Uniflash. 
The service pack binary file is not part of Uniflash and should be fetched from TI repository separately.

So Great.

Thank you for your response.