I've seen similar problems, but could not find a solution that fits this one: I have a IP406 phone system and was adding a new IP500 Phone 16. While performing the upgrade to 5.0 (69) from 4.2 (?), the upgrade failed and now all I get is a red light on the expansion module. The IP406 will not detect the module anymore. Is it possible to restore the expansion module to its original state?