Try updating to the latest firmware if the system will boot up (or try a firmware recovery if it won't):

Latest firmware

https://www.dell.com/support/home/en-us/product-support/product/precision-15-7520-laptop/drivers

Dell firmware recovery process:

https://www.dell.com/support/kbdoc/en-us/000132453/how-to-recover-the-bios-on-a-dell-computer-or-tablet

Have you tried updating Intel Management Engine Interface to the latest version from Intel website?

Though flashing latest BIOS is the first step I'd do, as stated above.