Have you considered crowdfunding?

Investment grants will be able to take care of funding but crowdfunding has the benefit of taking care of funding and providing a customer base.There are many examples of teams without a fully working prototype being successful on these platforms.

Kickstarter will be off the table but you have some great options with Indiegogo (https://www.indiegogo.com/) and the Brazil specific network Catarse (http://catarse.me/en)

Of course, you will have to focus on things like presenting your story and getting attention for a bit but if you are successful you will have money for a prototype, access to a customer base and exposure that could bring some helpful people onto your team - even the angels and VCs you'll need to get to the next level.

Message me if you need some help - I'm not personally an expert in crowdfunding but I can connect you with some of the best in the business.