Hmm, just watched the video - he talks of the common line on the motor outputs being connected to CW+ and CP+, which is not my instinctive understanding of the way BoBs normally work (and I've just googled a couple of schematics to confirm) - it's worth - before wiring things up - just checking with either power on the board, or continuity-checking on the board, whether the common pin on the driver outputs are connected to +5 (as in the video description) or 0V (as in the schematics that I've seen). Also, I found this link https://www.machsupport.com/forum/in...0;attach=41290 which also suggests the similarly-looking board (under all the dust) that the common is 0V.

Without the board I can't claim either is right or wrong, but with the uncertainty presented I'd check where the common is connected - Just try a continuity check between common and 0V, then common and 5V - if the 0V line presents the lowest (near-zero) ohm resistance then the wiring on the video is wrong - you'd connect COM to CW- and CP-, and the pulse/direction signals to CW+ and CP+.