The default password for the NExT is “NExT” or 4E 45 78 54 in hexadecimal… but the problem is that every NFC app seems to handle passwords differently. For example, if you set a password using NFC Tools then TagWriter can’t use it, and vice versa… and neither of them are just straight forward ASCII… so we set the password to NExT and if you enter NExT into NFC Tools or TagWriter, you get a fail error… it’s so lame.
The good news is, that the password only protects pages E3 through E6 and those are config pages, so all the user memory is left available for read/write without a password.