MBL1660A sensorless control not avalable for firmware V2.01

Hello,
I use a MBL1660A to control a BLDC with sensorless trapzeoidal control.
I have used firmware V1.8 which works more or less well. But after upgrade to firmware V2.01, in the swithing mode, there is no more the trapzoidal sensorless option.
The robot run + is version 2.1.
So someone can help me to know how to use sensorless swithing mode for MBL1660A v2.0?
Thx in advance
BR