Originally Posted by janko

IMPORTANT - when ordering a Crumb128 5.0 please do not forget to specify a bootloader to be preinstalled. I made that mistake. I did not notice a check box for it on the chip45’s order page and I got a board that could not be flashed with their GUI. Fortunately, a local electronic shop has an inexpensive ISP adapter – usbtiny ($22 CND) which I used to install the BigXionFlasher software. Still, that simple mistake delayed me for few days for learning about MCU programming and tools used.
One more thing I would also recommend. Instead of buying hirose connectors and wire just buy a BionX communication cable extension. They come in different lengths – from 30cm to more than a meter. On this way you will avoid soldering those tiny pins which is next to impossible with any standard soldering tool. The connector is easy to unscrew so you can see which coloured wires you will need to cut.
Anyway – the final result is excellent. My good old 20” wheel 500W BionX system with the new 48V battery now goes over 50 km/h. The max speed when there is no load is just over 60 km/h, but with my weight and air resistance the real speed is around 50 on a level ground.