Polycom ip430 won't provision

Using EndPoint manager I can’t get Polycom IP430’s to provision. It works fine with ip501’s and ip550’s. It does create 0004fXXXXXXX.cfg, 0004fXXXXXXX.-300.cfg (extension) and 0004fXXXXXXX-directory.cfg under /tftpboot/, but it just sits at “Welcome! processing configuration” screen.