You can update your 8.1J sysNAND to 9.2 if you have access to a copy of Cubic Ninja, from there you can create a fresh 9.2 emuNAND.I'm stuck on 8.1.0-0J, which doesn't have the multirom menu. Can I update emuNAND with a physical cart like MM and get 9.4 this way, or will this brick my device?
See this thread for all you need to know.