I have upgraded the bios from A10 to A15, but it happened a serious problem, my computer now can not ghost anymore, every time ghost it automatically shutdown, even when I use in dos it had too, a cooling system work harder than normal and very hot,but there is special in that I still install and use a normal window

I had dowloaded and installed Bios: N5010_A10 from dell.com but it didn't 

Now I want to downgrade it to A10, if you know how to do please help me do it

thanks alot