Planning the installation / 207N0130943 02 Modular ICS 7.1 Installer GuideUpgrading your Norstar systemWhat procedure you use to upgrade your Norstar system willdepend on the version of MICS software to which you areupgrading.Upgrade notes:• When you are upgrading from a 4.1 or later system, ensurethat you have a release version 2 NVRAM cartridge.• When making simultaneous hardware and softwareupgrades (e.g. 12-port expansion plus a MICS 7.1 softwareupgrade), upgrade your software release before makingyour hardware upgrades.• Ensure that you power up the system after the newsoftware has been installed, but before any new hardwareis added. Upgrading in this order maintains your 0X32 ICSprogramming data for use with MICS 7.1 andMICS-XC 7.1.• If you are upgrading to 6.0 or 6.1 software, note that linerenumbering will occur. Refer to the wiring charts inWiring charts on page 260 for changes. This renumberingwill also affect DN and mailbox numbering for any voicemail or CallPilot applications you have running on yoursystem.Upgrade note for MICs 7.1: -Direct upgrades to MICS 7.1 are only supported fromsystems running MICS 6.1 or 7.0 software.
