Most of the guides I've found (for GoPro models) say that the bootloader prompt can be interrupted, although this one just immediately prints "`booting from primary partition`" and after around 30 seconds something like a MAC address.
If you want to play with the Fourier Transform of 2D curves: https://osresearch.github.io/fft-doodle/
Make your own version of the customizable helical mobius! https://www.thingiverse.com/thing:5189077
Hurrah! It's bridged the gap between the seven pieces, making it into one Mobius strip now.