For all I know you are thinking it wrong!
The specific regional firmware images are what the device was shipped with, it might only deactivate things prohibited in that region and not make it fit for a specific provider area. If you flash it with the 001 image you should just do fine, unless the provider is using a band the device is not capable of, that would be a hardware issue. I don't know if flashing with something higher (in number) than 001 will actually do good as the 001 image is the most you can get.