You can update emunand by installing all 9.5.0-23 system cia's, but nintendo deleted all titles from their server which are older than fw 9.9, so you have to google to find an 9.5.0-23 EUR/J/EUR package, then install them with Devmenu, technically, you can use FBI, too, but FBI failed at some cia's installation when I tried, no problems with devmenu
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was to slow, i used gw mode, don't know if rxmode works or not - ithink your emunand may be bricked now - reformat emunand and try it again