The way you likely have things setup is that OSMC and RetroPie have their own partitions on your SD card. You should be able to mount the RetroPie partition and make any changes you’d like. There’s no intentional blocking of anything going on. But those hybrid builds don’t come from here and aren’t supported officially so you’d have to ask whomever made your sd card image for all the details.
Reply To: RETROSMC