Power & Source of Big Ideas

Hi, im new here and just got my M4. the emmc flasher utility reminds me of berryboot for the rpi a bit, i guess i was wondering if someone could explain how berryboot and the emmc flasher friendly elec supplies both work to help me find a way to make a dual boot screen or boot-loader type applicatio...
I'm using the official RPI case. i used an exacto knife to cut out the bottom, soft plastic made it easy. the usbc hole needed to be enlarged a bit but no big deal. Remembet to cut off the fin between the usb ports to leave room for the uart. I chose this mainly for the fact that the top and side pl...