hi!
I am having exactly same problem, and the solution that worked for the OP, namely no symbols but a mix of lower and upper case and digits, is not working for me.
I wonder if someone may clarify what a “symbol” is meant to mean here, or at least what characters are accepted as symbols.
I have tried a large number of strong passwords, but even the one I use with my CLX-22, in another machine is not accepted. I keep getting the message that it must contain at least 8 symbols.
I have been trying many formulations with 8 different symbols plus lower cases,upper cases and digits, but keep getting the same message and the installer does not allow me to proceed.