Don't update or you will brickguys still have thos problem :C i already put it on recovery mod
http://www.homebrew-connection.org/3ds-parental-tool-remove-the-parental-restricition-easily/ - try this tool. Swizzy is a known developer for Xbox 360 hacking. This is a really really old tool, but it might use the correct one for the 3DS version.i found something i wonder if its safe to do it https://github.com/Plailect/Guide_RedNAND/wiki/3DS-Stuck-(2.1.0-Without-Functional-Browser)
have NAND backup but im scared to do a hardmod :C and for the thing i saw with the link i posted is to update to 4.1 to be able to use Decrypt9I assume you made a backup of your NAND during the ctrtransfer? if you do you could always restore with a hardmod which I also assume you don't have?
Worst case hardmod with a NAND backup will work.
Hard mod is a last resort. I did it to my 2DS just in case. To be frank, I was really worried that I would fuck it up but It went just fine. Took a while and I did have to get a good soldering iron and good solder but it was easier then expected. If you can do the update to 4.0 do it and try the decrypt9 thing. Unless you really fuck things up a hardmod should fix it. Better then having a paperweight right?have NAND backup but im scared to do a hardmod :C and for the thing i saw with the link i posted is to update to 4.1 to be able to use Decrypt9