Cant go back to international firmware

thats my problem, I have the international phone (M461) and it came with the international version, then i went to A version.
Now i e¡want to go back but i just cant. Every time i try to do it i get firmware corrupt. I can go to any A version, but i am just unable to go to any I version
some help guys? =(

Which firmware are you trying to load? And which are you on? And where did you buy it, is it really the international version, or did someone made you believe it? Im not into all the type numbers, so that is why I am asking.

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