Default [Q] extract rom format. img

Hi all.
I come here desperately seeking someone can give me a solution.
I come on behalf of several chefs who are trying to improve the ARNOVA ROM 10.
We have always worked roms in. Zip rom and the ARNOVA 10 comes on. Img. The problem is that we have almost a month trying to extract the. Img but no way.
I would appreciate someone give me some clue to how we could extract the. Img to work on it and then re-attach it to flash.
This is our last hope, so that any information we would be extremely useful and would appreciate greatly.
Thank you all and really sorry if my English is bad alo expressed if it was unclear please ask