I have the same problem (internal error 27) on a DL380G5 with NC373i
The older Version 4.0.0.22 (cp018468) doesn't work too.
Maybe the G5-Hardware is too old for that firmware (the "current version" on the Site "Server 2008 R2 downloads for HP ProLiant DL380 G5" is 3.1.1.22)