Besst is programming tool for Bafang motor used for dianostics changing settings or speed limit that isnt in the go+ app, or want to change firmware, can update firmware of all componants, some people make custom firmware, it plugs inline of the sreen and the motor so its pretty easy to connect dont need to pull motor out, . go to Bafang and download Besst Pro and use offline mode you can see what it does.
Bafang Best Pro
K1 Flash is just same as the Besst but you can just use SD card rather then plug laptop in, put updats on SD plug it into the bafang screen and do update.
K1 Flash (Dado is very active on EMBT also)
BBR can be used with phone to change settings over Terminal also it can set magic combination, so its unlocked speed then when you turn bike off it restarts as locked if anyone pulls you over, but you can change settings with command also.
BBR (made by dado)
I ordered the Besst tool with the Frame, If you were in Brisbane Austalia id be happy to lend it as its not something you use every day but coming from DIY 10kw Ebikes i will always get as much disnostic tools as i can we have no bafang shop here.