Changing Water supply from direct to tank

Hi all!

So, i just bought a Jura Giga 7Xc professional Coffee maker second hånd for my company. Previously it has been connected to direct Water supply - but it also has the funktion to supply Water from Watertank. However Jura has told me that i need to send it to the to have it reprogrammed - can that be real? Is there no way for me to access this menu to Change it?😄

If i just start it with power connected to it, it will keep telling me that the machine is filling no matter what i press..