Nothing pops up when I plug in Cerise

Make sure to check which color is the boot LED. Green means there is power but no USB data/connection (this is normal when using via PoE power). Cyan means there is both power and USB data.
Troubleshooting no USB data is usually a bad cable but not always. Try a different know good USB cable and try without the provided USB splitter. Sometimes certain cables might work one way but not the other, as USB-C connector can be plugged-in both ways, so it’s worth trying both ways.
If the cable works but you don’t get data you might want to check if the USB port of your iPad/computer works. Sometime these can be disabled in settings or if the ipad isn’t unlocked (see below for more info).
If the issue persists you may want to try updating Cerise to the latest firmware as this will overwrite potentially corrupted parts of the memory.
If none of this fixes your issue, please submit a support request.