https://github.com/vrana/adminer/wiki/Enable-sqlite3
I decided to enable sqlite in adminer follow it, but I could not connect to my sqlite file, so I looked at how the main branch did.
It was set to new AdminerLoginPasswordLess(password_hash("YOUR_PASSWORD_HERE", PASSWORD_DEFAULT)),, while the Wiki was set to new AdminerLoginPasswordLess("sladmin", password_hash("mypassword", PASSWORD_DEFAULT)), and I thought maybe bug happened in that place.
I mean, if I use the Wiki setting (User:sladmin, Password:mypassword), I get the message that 'Database does not support password.', but if I use the main branch setting (User:admin, Password:YOUR_PASSWORD_HERE), I will be able to connect to my file.
And I also tried to change 'sladmin' to 'admin' to see if it was the problem of wrong username but stiil got the error massage.
So, it seems that there shouldn't be a username in AdminerLoginPasswordLess if you want to enable sqlite.
This may help you,
This for sure will solve the problem, to log in to sqlite database.
You are supposed to set your own password.