I used SCB version 3.20 and there was no mentioning in datasheet of oversamplingf < 6.
yes that's different in 4.0, and a lot more...
Hi CDC users,
This is an issue with the component. This will corrected in the next component version. Till that time you can change the oversampling value directly in the SCB_CTRL register (find register details in the TRM) after SCB_Start or Init was called.