I'm not sure if this is the right place to ask this question but:

I Have a customer that wants to give lottery gifts to their customers (Lumia 920) phones with the company app (It's already in the marketplace) and lock screen jpg. Customized / Pre-installed to it.

What are the options?

- Installing an app and removing the windows account after that is not possible.
- XAP installation fails

The only reasonable way achieve this (what i can think of) is to have a customized firmware like operators do.

Any suggestions?