BRRRR method financing explanation!

[Derrick Gober]

I understand the method as a whole, but what I’m confused about or need to better understand is the financing. Is it a good idea or is even possible to obtain a mortgage through a bank in the initial buying when using the brrrr method? Or in order to refinance to pull your investment back out do you have to start with a hard money loan? I guess it’s the details/rules about refinancing that I need more detail about to understand. Thanks in advance!