On the old IVS you would need 1820 or 1830 software as a minimum. CMD F63 de 05fff67 de the first two digits tell you what level the 1800 is. 02, or 03 is what you would need. However, CMD F83 de 0 de needs to have an IVR number to activate the CPU advanced features. This number can no longer be obtained from NEC. The number is also wiped out if you default the CPU or store it for a long period of time with no power. Obtaining a CPU in the secondary market is taking a risk. given that the IVS and IVS2 systems are MFGR. discontinued, you would be bettor off accepting that you got your money's worth on the system and purchase a new one.