He instalado el foro desde 0 la versión 3.1.2 y al importar el backup de la base de datos todo correcto, pero cuando me identificó como usuario me sale esto:
SQL ERROR [ mysqli ]
Data too long for column 'user_password' at row 1 [1406]
SQL
UPDATE phpbb_users SET user_password = '$2y$10$v71dmfMmUKN2TrQBVNAg1.H5LPoVs34ceNjZnwTNXBXydbR.MVaWG' WHERE user_id = 2
BACKTRACE
FILE: (not given by php)
LINE: (not given by php)
CALL: msg_handler()
FILE: [ROOT]/phpbb/db/driver/driver.php
LINE: 855
CALL: trigger_error()
FILE: [ROOT]/phpbb/db/driver/mysqli.php
LINE: 194
CALL: phpbb\db\driver\driver->sql_error()
FILE: [ROOT]/phpbb/db/driver/factory.php
LINE: 329
CALL: phpbb\db\driver\mysqli->sql_query()
FILE: [ROOT]/phpbb/auth/provider/db.php
LINE: 189
CALL: phpbb\db\driver\factory->sql_query()
FILE: [ROOT]/phpbb/auth/auth.php
LINE: 937
CALL: phpbb\auth\provider\db->login()
FILE: [ROOT]/includes/functions.php
LINE: 2831
CALL: phpbb\auth\auth->login()
FILE: [ROOT]/ucp.php
LINE: 84
CALL: login_box()