My CFW guide has a way around this using emuNAND though it has been reported that you need to use cakes rather than rxTools with the method I use... Basically my method is to make an emuNAND then boot into the emuNAND with CFW while it's linked with your sysNAND and then install sysupdater with browserhax, launch it on sysNAND with pasta and update to 9.0-9.2 where you can use themehax to autoboot CFW