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;