I've never had too much of an issue jumping small numbers of versions at a time. The BIOS is already up to date in your post (6.6), so that much doesn't need to be worried about. For the iDRAC, I'd update to 1.99, then 2.80 (oldest 2.x version I'm seeing hosted) then to the current 2.92 version.   iDRAC6's web update interface is for the iDRAC firmware only, it may also work for the BIOS (it's been too long since I've needed to test or check, so take this with a grain of salt). That said, with the BIOS already being up to date, that's a bit of a moot point. Your other items, like any PCI NICs or a PERC, wouldn't be updatable through the web interface, though.   If you only have 1x of these systems, I'd go ahead do the updates this way. However, if you have a bunch of these systems, you can use Repository Manager to create your own firmware .iso. I've only done this once and remember there being a bit of a steep learning curve to it, but this was also quite some time ago.
Hi currently got a r710 running   Description PowerEdge R710BIOS Version 6.6.0Name iDRAC6Product Information Integrated Dell Remote Access Controller 6 - ExpressFirmware Version 1.85 (Build 03)Firmware Updated Fri May 25 15:07:50 2012Hardware Version 0.01 I am hoping there someway to run something just once rather than having to work out what I need to download for each separate update please   Many Thanks  D
Advice please - just got a refurbish r710 - badly out of date - is there a 
quick way to update everything?