I got it to work by downloading 2345-12365-001.bootrom.ld, bootrom.ld, 2345-12365-001.sip.ld from the Polycom website and i moved the files created by the Endpoint Manager to same tftp, well what i am sure of is that Endpoint is not downloading the firmware for 331 to the tftpboot folder, because i tried another phone type and it worked, anyways now that i got it to work like this, i would like to activate Users & Devices, how can i do that ? is that a module?
Note: let me know if you would like me to do some tests to check the firmware download issue with Endpoint!