I had this problem on Friday, was testing a customers main board and operation unit in our 400Ci, their boards corrupted my engine board. I tried the boot procedure and wound up with a "Hi-Voltage CPU-ERROR". Read this information and opened up 500Ci series update Ver 10 copied the following files to a USB stick DL_ENG.2H7 ENG2H7_1000023001, P_update and zImage.kmmfp. Placed the USB in slot A2 by in back. Turned on, I figured what the heck it doesn't work might as well give it a try, well it accepted the engine firmware. Next step is to load the full firmware upgrade, thie now worked and did not give a "Hi-Voltage CPU-ERROR". This worked for me I cannot verify that it will work for you. I chose the 2H7_ENG files because the 400Ci boards are 2H7 or 302H7. For the 300Ci the 2JZ_ENG files should work.
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