unconvert
/ʌnˈkɒnvərt/Definitions
1. verb
to change something back to its original form or state
“The software was unconverted to its original version after the update.”
2. verb
to remove or cancel a conversion or change
“The new policy was unconverted, and the old rules were reinstated.”
3. noun
a process or action of changing something back to its original form or state
“The unconversion process took several days to complete.”