Thanks a lot for your help and for my english, I give the best of myself every day
With O3DS, i haven't any probleme but with N3DS, it's my first fight
Does this help at all? The person who posted it said they were successful. I included the link at the bottom-->
Install sysupdater on sysnand, place all update CIA files from 9.2.0 in the Folder "updates".
Now a VERY important part:
Use a CFW WITHOUT firmlaunch to open sysupdater! I used PastaCFW, but you can use PBT or rxTools devmode too. Now launch sysupdater and follow the instructions.
If everything goes well, congratulations, you successfully updated to 9.2!
Just in case something has gone wrong, you still have your nand backup. You would just need a hardmod to restore it.
(From Reddit)