Ok. So finally got this to work. Was not the easiest upgrade owing to the failures. i entered the two commands below to get it working maintenance --remote_access --racreset system --init after going through the initialization process, i entered system --reboot [To reboot the appliance] after the reboot I did the upgrade again system --upgrade After 10 minutes or so, voila    Did a system reboot as above and now able to work. 
Been struggling to upgrade Dr4100. Started yesterday with GUI upgrade which failed. tried to upgrade from cli, failed even with multiple reboots.  Tried again today with gui in maintenance mode and still failed. cli upgrade failed. i re-downloaded DR-UM-3.2.0194.0.tar and went through process again with the same results. Anyone come across this issue before? DR4100 was unfortunately highly marketed to the client in terms of the dedupe ratios to be expected.  In terms of setup, using 1x 10GbE interface connected dell N4032F switch. The device has 2x 10G interfaces and 4x 1G, all bonded I believe.  Hopefully someone out there has come across this upgrade issue before. Thanks in anticipation VKS  
Dell DR4100 Upgrade