I have this also with cleared ME
you can give it a try
http://www.egyfixlab.com/laptop/threads/series-5-notebook-np530u4c-pcb-ba41-02014a-bios-main-ec.375/
Models : Dell Latitude 5280/5288/5480/5488/5580 and Precision 3520 System BIOS
Factory Update File :Latitude_5X80_Precision_3520_1.11.1.exe
Type : Main + EC
PCB Number : LA-E!41P REV 2.0 A01
Size : Main 16MB + EC 1MB
Others : Universal File with Clean ME