This method no longer works as-is because Nintendo removed the update files from their servers. You now need to host the files on your own server and modify the GetAccountStatus request to point to it.
I posted this http://yifan.lu/2015/03/23/nintendo-3ds-system-updater/ but I thought some people here may be interested. Please note this should only be attempted by those who understand what they're doing (aka, this is not noob friendly). Hopefully someone may make a more...
[GUIDE] Upgrading 8.1.0-0J to 9.2.0-20J
I posted this http://yifan.lu/2015/03/23/nintendo-3ds-system-updater/ but I thought some people here may be interested. Please note this should only be attempted by those who understand what they're doing (aka, this is not noob friendly). Hopefully someone may make a more...
[GUIDE] Upgrading 8.1.0-0J to 9.2.0-20J