its a tested SQL code, so you should test an update query in phpmyadmin. If that manager program uses some kind of a CAST on the field names, you should use that method.
if you're using a reserved field name such as order, date now , group as a field name, you should use the ` qoute. i've never heard a syntax you've mentioned on UPDATE statement.
i've tested this:
UPDATE `usr` SET( username, pass ) VALUES (
'a', 'aaa') WHERE 1
MySQL said: Documentation
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(username,pass) VALUES ('a','aaa')' at line 1