This tool can convert your own XCI dumps into header patched NSPs who can be installed (with the content type patches for FS system module).
Before any explanations:
I'M NOT SUPPORT PIRACY, THIS PATCH AND THIS TOOL ARE FOR INSTALL YOUR OWN GAMECARD DUMP!
THIS PATCH AND THE TOOL ARE PROVIDED AS-IS AND I'M NOT RESPONSIBLE OF ANY DAMAGES!
First you have to dump own your gamecard using nxdumptool by DarkMatterCore to get a XCI dump.
Then you have to convert your XCI dump with XCIRepacker into a header patched NSP file (Usage below).
Install the content type patch for Atmosphère or Hekate (Explanation below).
Install the converted NSP using Goldleaf by XorTroll.
Content Type Patches installation
(1.0.0 - 8.1.0 | FAT - ExFat)
Put the Patches\atmosphere content inside sdmc:/atmosphere and reboot your switch.
Put the Patches\bootloader content inside sdmc:/bootloader and reboot your switch.