Hacking New SD card

[XCleone]

A while ago the memory sd of my 3ds broke, now I bought a new one and I do not know how to do to have the cfw and b9s again, thanks

 

[Kubas_inko]

A while ago the memory sd of my 3ds broke, now I bought a new one and I do not know how to do to have the cfw and b9s again, thanks

The least you need is boot.firm (from luma3DS) in root of your SD. If you want more, just download anything you need and put it in right directories.

 

[Termer]

Just drop the boot.firm from the latest Luma3DS release into your SD card. If it won't boot, then you are using an old version of B9S and you should use the Luma3DS release before Rosalina. It's release 7.1
EDIT: If you are indeed using an old version of B9S, I suggest that you folllow the Updating Boot9Strap page on 3DS.guide