Hi repulsor,   well, you did pretty much all the necessary steps to get the USC back to work, good job. The fact that it did not solve the issue shows that the flash seems to be corrupted somehow. From what I see, the only way to get the system back working is to get a replacement motherboard.   You might search for a part with that Dell part number F9NPY or even the whole Service Kit: MY04J.   Best regards,Stefan
Hey, all.  First time post here.  Glad to be here - looks like a very helpful community.  Be gentle  So after a failed memory upgrade from 2x4GB to 4x4GB (one stick of the new pair was bad), I started to have problems getting this previously working r210ii to boot.  The biggest issue I see, selecting F10 gives me: "MAS001 partiton not found!   Unable to launch System Service image. System halted!" In the boot manager, in either UEFI or BIOS mode, I used to be able to select from HDD or USB devices.  Now I only have one option for each of HDD and Network boots - and either immediately fails with "Boot Failed." Also same with the F12 option to boot PXE - immediate failure, no attempts at DHCP discovery as it would normally perform in the past. System does have both iDrac Ethernet and Express devices and I can log into the iDrac web interface.  I have applied the LC_Repair_Package_1.7.5.4_A00.usc through the iDrac web interface serveral times and it makes no difference. I have also tried removing the iDrac ethernet and Express devices.  Booted with nothing but a single RAM stick, power and VGA attached... cleared FLEA... waited 10 minutes with no power... waited 10 minutes after connecting power before powering on... all the things I've found via Google. I'm pretty much out of options at this point.  I cannot boot any media at all - would love to try updating the BIOS but I can't even boot a simple DOS image.  Ideas of what I can try next?     
r210ii will not boot - MAS001partition not found - stuck.