Error 502 CMOS reset on EliteBook 840 G1

Hey guys So I followed this guide to install High Sierra on my old HP EliteBook 840 G1.

I can get through the installer but after the Installing: XX minutes remaining screen, it reboots into an error Error 502 CMOS Reset and I need to go through the whole installer all over again. What am I doing wrong?

submitted by /u/gathurian
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