Here is the response I received from the Bulls rep. It doesn't appear the codes or programming are going to be made available from the OEM. It is interesting the speeds I was able to maintain in each assist level are a little different...
"To answer your question regarding the assist level, the setting is as follow:
- ECO: assist level of 60% of human power and up to 20kmh (12.5mph) and then going down.
- TOUR: assist level of 100% of human power and up to 20kmh (12.5mph) and then going down.
- CLIMB: assist level of 140% of human power and up to 30kmh (18.75mph) and then going down.
- SPORT: assist level of 170% of human power and up to 45kmh (28mph) and then going down.
This cannot be modified at the dealer/consumer/OEM level as it is pre-determined by the manufacturer.
Same with the walk- assist mode, this is pre-determined too and it is designed for the case of emergency.
Hope this answers your questions."
(Link Removed - No Longer Exists)