The Intel® Server Board S1200SPO is compatible with the Intel® Xeon® Processor E3-1230 v6; however, this processor was released after the board; so it is necessary to update the BIOS of the board to version 02.01.0049 at least using an Intel® Xeon® Processor E3-1200 v5.
The compatible processors are below
The BIOS version needed is the following.
Intel® Server Board S1200SP Firmware Update Package for EFI
If you need further assistance please let me know.
Thanks for the advice! I'll try to update and write the result.