Cube 3D printer community

Thanks for the info. I have some questions though, appreciate if you can help.
What kind of generic PLA filament is necessary? I guess its diameter should be 1,75mm but should I care about melting point, do they differ by brand or is it common for all PLAs?
In between step 5 and 6 in your trick, when we remove the dummy cartridge do we press anything to continue printing, or does it continue itself after sometime.?
What is your firmware version? Is this applicable to new versions as well?
Thanks