Is there a way to upgrade only new 5420 phones added to phone system to release 5.0? It seems our phone system is not upgrading our new phones to the latest version available on our tftp server but leaving them at release 4.0 (maybe because it is happy enough with that version?). Should I try forcing them to be the same as version as the rest of the phones in the office (release 5.0)? Can I do this without trying to force all of the phones in the office to re-update if they are already on the latest version?