It implies that you are returning the instructions to their original state, typically by removing any customisations or modifications that have been made.
Here are some possible contexts where you might encounter this phrase:
* Software: Resetting the default settings of a program or application.
* Hardware: Restoring a device to its factory settings.
* Procedures: Reverting to the original instructions for a specific process or task.
The specific meaning will depend on the context in which it is used.