this is really weird but i'm happy for you, my friend which was going to donor the LFCS got banned yesterday so... yeah i'm waiting for a 1 DS solution(safe) for 002It only occurred once.
When I did the normal way, I thought that my second 3DS's LocalFriendCodeSeed_B was also banned because 002-0102 was still present after injecting the neccesary files.
So I got scared and I said: "I will accept my fate"
I injected BACK my original NNIDsave.bin
I injected BACK my original LocalFriendCodeSeed_B
I injected BACK my original SecureInfo_A.
And magically, it worked.