How to get rid of all save() flash memory code?

I experiment with some standalone datalogger which issues save() internally for data persistency.

When I use reset(), the code is still in the flash memory and can be used with load(). That's OK.
But what is the correct way to reset the flash memory to a neutral state?

For the moment in time I use "reset();save()"

But when the PICO is connected to a USB I get a constant green LED and the dump() says:

dump()
setSleepIndicator(B12);
digitalWrite(B12,1);
=undefined

1st question:
So is there a way to clear the flash so there is no "setSleepIndicator(B12); digitalWrite(B12,1);" ?

2nd question:
Is there a way for a 'mute' save().
save() generates a lot of output to the console; in standalone this may overflow the buffers.

Greetings from Frankfurt/Germany, Uli