I want to setup my deco's in 2 houses.

currently i did the setup in 1 house, with 3 deco M9 Plus and 4 deco M5.

main Deco is an M9 Plus

they are all in one network working properly in one house, firmware is all updated 

i want to move the 4 deco M5 towards another house in another city.

I am taking only the deco M5 to that other house, so not the main deco.

in the Deco app, when choosing maind deco,  i cannot choose anymore M5 as model  !?

does that mean that my old M5 cannot be used anymore , only at my old home  ?