I have a Deco network using the 3 pack Deco E4. After a year, I decided to add another one, this time M4. I want to use it as the main Deco router, but it tells me that my password should have an Uppercase, lowercase, number, symbols. Our wifi password is a simple one and would like to stay as it is. I didn't have any problem setting a simple password when I use E4 as my main router. Any workaround for the M4? Thanks