i had the same problem before.
and this is whay i did.
1. backup ur save game at checkpoint
2. delete all your game in data management.
3. delete all file that wrote in number in nintendo>content>placehld
nintendo>content>registered
4. make sure copy compatible sigpatch finto your firmware version in folder atmostphere> kip_patch and exefs_patch
5. install nsp via goldleaf, tinfoil or etc..
and this is whay i did.
1. backup ur save game at checkpoint
2. delete all your game in data management.
3. delete all file that wrote in number in nintendo>content>placehld
nintendo>content>registered
4. make sure copy compatible sigpatch finto your firmware version in folder atmostphere> kip_patch and exefs_patch
5. install nsp via goldleaf, tinfoil or etc..