Hi Anhtu,
The DIP switches on the Mini Converter SDI to HDMI shouldn’t alter the video conversion, they’re really just used for audio, and the Processing switch currently does not do anything. The converter should always convert 23.98PsF to P. However I would suggest leaving the DIP switches in the default OFF position, and switch ON only those switches you need for the settings you require, based on the diagram on the underside of the unit.
If you are still having problems I would suggest contacting your regional support team either using the phone numbers on the following page
https://www.blackmagic-design.com/company/
or using the support request form on the product’s page in the support section of the website here
https://www.blackmagic-design.com/support/
Chris Pearse
Blackmagic Design