Well, the obvious answer would be to get an SI.
In Exadata Image is integrated with latest ILOM + BIOS + All the firmware.
If your having valid CSI, Download the latest image and update the same.
Note: You can update the ILOM firmware on these DB and Cell nodes, You have to have a valid CSI.
I bought this SH for private use, no company .... now i start regretting the investment
Maybe the company where you have bought the servers from does have a valid CSI and they can help you out at least this time?
no they can't, was just a resell company, i try already