Basically, you don’t have to worry about the password,
It is there to protect you from yourself.
The DT app protects critical sectors, preventing any other app from locking you out from your own chip.
The rest of the sectors remain available to read / write as you see fit.
NFC Tools does some good stuff, but I would recommend TagInfo for when you are trying to identify chip types
Also TagWriter as an alternative to writing Data Sets