For the A10M printer it is easy to unload the filament of the E0 extruder by the keyboard!
But how to unload the E1 extruder film on the Geeetech menu command?
We know the command M701 and M702 to load or unload a simple extruder E0.
how to make the change in MARLIN?
To make it easy I turn the wheel of the E1 extruder by hand (it's not easy)

Thank you for your help.
cordially