Hacking Updating to 4.5.x

[Codc]

I was wondering if it was possible to update a 3ds to 4.5 with a 3ds rom.

I know gateway recommends using a retail game to update your 3ds, but does anything stop us from using a 3ds rom to do so?

Has anyone updated their 3ds with a rom?

 

[Rydian]

If you can already run the 3DS, people say that it works.