My game cart slot never got updated. Yeah that RajNX pack is great.Regarding to the new Rajkosto hekate_ipl.ini file, the [PreventGCUpdate] is a stock firmware. If you launch a CFW from your previous .ini file, HBmenu will be accessible via the Album.
As your GCU is already updated, you don't need the nogc configuration.
Your best choice for now seems to download the RajNX starter pack to be sure.