UPDATE xf_user_authenticate

SET data = BINARY

CONCAT(

CONCAT(

CONCAT('a:3:{s:4:"hash";s:40:"', SHA1(CONCAT(SHA1('password'), SHA1('salt')))),

CONCAT('";s:4:"salt";s:40:"', SHA1('salt'))

),

'";s:8:"hashFunc";s:4:"sha1";}'

),

scheme_class = 'XenForo_Authentication_Core'

WHERE user_id = 8;