Fatest way to install EmuNand from 0 on Old3ds

Hello guys, first of all I would to apologize for my bad english.
I have some questions for you and I would be more than happy if someone got answers.

1. Does RxTools nightlies (over 3.0 ?) will lose all of his tools ?

2. Could you tell me if there is a way to boot on ReiNand without using RxTools with a formated SDcard on old3ds ?

3. Is there a way to inject FBI without using RxTools ?

4. Which is the fatest way ton install and boot auto into a emunand on old3ds ?

Thanks in advance !