Whoollybully, I've been struggling with the same issue. From searching older threads on this forum, i reached the conclusion that Dell no longer has a non iDRAC (express or integrated) way to run the 'lifecycle controller repair package", i.e. there is no way to burn an ISO file/image and run something off the DVD or USB drive at startup. The solution for me was to redo the firmware update using the Dell Repository Manager - just for the R510. During the deploy step, when creating the iso package, click the box that says (overwrite) even if firmware levels are the same. I flashed this ISO to a USB using Rufus and redid my update and requested reboot, and magically the F10 System Services option returned to the POST page and i could get to the System Services DELL GUI. Note that the R510 package i used the first time i just downloaded from the dell site and perhaps the download manager version is different. Next problem. I cannot start or see the Lifecycle Controller GUI, but assume it's because i still don't have and IDRAC (express or enterprise) installed yet which i ordered. Nor can i install the OS using the System Services GUI because it say it can't find the 'catalog file' . Lastly, during POST it's telling me no boot device is available despite having succeffully installed raid and pointed the boot sequence to the drive. It never stops :> Hope the first part helps.
We have a R510 that we wanted to use so we went to the repository tool and had it make an updater iso. That ran through and updated the bios and everything but now, we have no F10 option, it says update the system services .... How do I do this if the .iso doesn't do it. I have tried resetting the drac to defaults, that didn't help. If I ping the drac, I get a response but I can't http or https to it, or get into it via ssh. So, how do I resolve this issue with the system services?  
how to update "system services"