Some issues about .econst

Hello everyone, 

I am facing some serious and urgent issues on development of DSP F2812, I would like to have some helping :(

Here is the deal, I have been building a huge project , which was RAM based at first and had been working fine..

and recently , I have been trying to upload it using flash instead, I faced a lot of problems as I knew nothing about CMD.. 

Now , the problem is that my project has a USB storage function, which is used to store the data in USB.. and it worked fine in ram..

but when I tried to upload the program using flash, the USB function became no longer working,

and I somehow discovered that If I stored the .econst  to RAM block, It worked back again, but if i store the .econst to RAM block,

if the DSP re-power, the whole program wont work, I have to upload the program again to make it work, which means its still ram based..

whereas, if i store the .econst to FLASH BLOCK, in which it is supposed to be, if the DSP re-power, the whole program still works, but only the USB function doesnt work,

 Hence, I am here to seek some help on how to fix it or some suggestions , a little bit help would be highly appreciated..

Thx for helping

Zachary