VW Golf 1.6 TDi Reprogram ECU With Older Version Of Flash File

Is it possible to downgrade the ECU with ODIS-E?
VW Golf 1.6 TDi CAYC Engine Code.
ECU: 03L906023A
Flash (diesalgate) 03L997557M, Software version 9983 replace with (previous version) 03L906023B 9632. Possible with ODIS-E?
Thank you.