OK first off NEVER try to update emunand using sysupdater !!!
sysupdater will always update only the sysnand.
for backing up your save files of the installed CIA games, Download the CIA for an app called Save Data Filer. search for it on a certain iso site.
download the emunand tool:
https://gbatemp.net/threads/emunand-tool-release-and-support-thread.359239/
using the emunand tool, extract the emunand from your SD
inject the emunand.bin file you obtained in the previous step back into the SD
delete all the palantine CFW files (arm9 , arm11 , boot and launcher)
download the latest build of rxTools found in the first post of this thread
using the tools present in the download, get the firmware.bin file using the cdn_firm.py script
make the slot0x25KeyX.bin file using a hex editor and the slot0x25KeyX which can be found by googling for it.
place the firmware.bin, slot0x25KeyX.bin and the rxTools.dat file in the root of the SD
go to
http://launch.rxtools.com using the 3ds bowser.
you should now be in your emunand.
verify this by going to the system settings. you should see something like
RX-E ######
now just do the normal system update from the settings.
THE END