As partially said by Kubas_inko, RXTools doesn't support any kernel newer than 9.6 (meaning the last compatible OS is probably 10.2)
Luckily, as you probably have 9.0/9.2 sysnand, you can upgrade to a current-generation setup (Boot9strap entrypoint, Luma or Rei-Six CFW, no emunand required anymore) with little hassle: follow the instructions at the 3ds.guide website!