Aaahhhhhhh that’s why it doesn’t work!! I changed the standard one (123456) for mine including numbers, letters and special characters!!!
And yes, it’s possible to change it by terminal commands line or setting in disk app! But it’d be a warning about this limitation! I did both ways without receive warning message 
Anyway thank you for this info!
Now I’ve to flash again my L5 
PS: I found right now that also it’s suggested don’t use gnome disks to change password because it destroys encryption! So I’ve to change it just manually from terminal by commands line, correct?