How did you confirm they wouldn't delete, were you able to copy them to the card again after running the del script?

Yes rgn48 is internal drive. I did think that it wasn't copyable in 2x5 series, only deletable. Maybe i'm mixing it up with 2xx/3xx/6xx.

Best wait for opinion of kunix and/or Loly etc.

What size is your 41.bin?