Im using a 2ds version 11.2.etcetc
https://github.com/44670/BootNTR/releases/tag/bootntr_3.1
"Copy *.bin files in ntr.zip to the root directory of sdcard, do not rename the .bin files.
Install BootNTR.cia on New3DS, install both BootNTR.cia and BootNTR-Mode3.cia on Old3DS."