How do I return the ECU to factory condition?

Hi!
How to return the ECU to factory condition.
After writing by the FTecu program, the block is no longer readable by other hardware.
There are not enough maps in the program to fully configure it.
how do I write a stock file to the ECU?
so that there are no restrictions on the operation of other equipment.
Comments
We do not lock our ECUs in any form. If you want the ECU to be as close as possible to stock, you can flash the stock image.