[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 noob friendly solution based on this information (like a NTR plugin with a hosted SOAP server). Also, this procedure can be used to upgrade any version to any other version (maybe even downgrade provided you are...

[GUIDE] Upgrading 8.1.0-0J to 9.2.0-20J