trying to calibrate, but...

I used to be able to calibrate the step to mm by sending the command M501.
I would get something like:
M92 X88.89 Y88.89 Z1511.81 E88.57

and by changing those values, I can calibrate my dimensions. 
But now, when I send M501, I don't get that response any more.

All I get is:
echo: stored settings retrieved

How do I turn that back on again?  
Thanks for your help.
TB

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