I know things have changed since I last did an RGH setup, which is probably where the confusion comes from; things are changing even though the scene was most active 10+ years ago.

I imagine you don’t need a NAND flasher now that ABadAvatar exists, but I could be mistaken. The process used to be, at a really high level: solder the NAND flasher/dumper, dump the original NAND, solder the RGH timer, then flash a NAND with a good timing profile for that console.