Not sure if that one comes with candlelight firmware already installed...
Did you take a look at post 1 in this thread?
If you are not good with computer stuff and only need to change PAS 1 on that one bike and you don't need all the extra's from bafang canable pro, you can consider that
Varstrom tool which is ready to use (with his own
varstrom program).
Maybe in your case the easiest way is
to buy the DPC010CN (pricey) with that display you can change the riding parameters and also max speed, wheel size etc. on
BBS0XX canbus. This display works on other Bafang can motors too but changing max speed limit on
older motors does NOT work with this display.( Or they must have changed the firmware sinds first release but the one i have can't ).
Some people here are using this display with BBS0xx motors so maybe they can tell what exactly can be changed or not.
It works with bafang go app too, from which you can change settings via your phone which i don't use because it ask's to much permissions for my own liking.
It has to be the DPC010
CN ! And not the DPC010CB because the latter has normally no "advanced function" and can not change the max speed limit if that is a requirement.
Tweaking the throttle lag etc. i think it's not possible or things must have been changed but not many users are posting here there findings .... Except for when things go south lol.