V1.8 and V1.9 iLive systems are not compatible
A DSP module upgrade is needed to the modular iDR10 and iDR0 MixRacks to run V1.9.
(Fixed format MixRacks iDR-16,-32,-48,-64 do not require this upgrade)
The user should not attempt to upgrade to V1.9 until they have the new DSP module.
The system would be unusable until the new module has been ordered and received, or need to be downgraded to V1.8 to restore the original operation.