@hwtaro9 I've never seen bala 2 work with the UIFlow blocks they provide (are those even for the Bala2 or just Bala?).
When I had a UIFlow program on mine I had to set the i2c registers in python code (in an execute block), which works but implementing a PID loop in there wasn't something I wanted to do.
It would be great to have official UIFlow blocks for that robot though, it's really nice hardware.