Yes, just make sure you're in emuNAND, go into system settings, go straight to the system update function (don't back out or reboot or anything else, just go straight there once you're positive you're on emuNAND), and then update that way. Or get sysupdater, the 10.5 CIAs, and install them manually with it while on emuNAND. If you're worried about it, make a backup of your emuNAND for just in case anything goes wrong.