<< Solved >> Catalina 10.15.4 Supplemental Update > Getting CMOS Checksum Errors on Every Boot

[BruceLee5000]

Getting CMOS Checksum errors on every boot after updating from 10.15.2 to 10.15.4 on the original 2011 CustoMacMini.

 

[FLP]

Getting CMOS Checksum errors on every boot after updating from 10.15.2 to 10.15.4 on the original 2011 CustoMacMini.

Terminal command sudo nvram wake-failure=%00%00%00%00%00 fixed that annoying issue for me. it was on an i5-2500k gigabyte z68P-D3 system.

 

[FLP]

“sudo nvram wake-failure=%00%00%00%00%00” worked on the 2nd boot as it only takes effect after the next boot.

 

[BruceLee5000]

Still got the error after 3 or 4 Restarts.

Changed back to a much older BIOS preset, that I suspect is actually the same as Last Good Boot settings.

Deleted Library/Preferences/PowerManagement files to address unexpected power offs during Sleep.

[SOLVED] sleep=shutdown

I updated my hackintosh from High Sierra 10.13.6 to Mojave from iTunes yesterday. I updated on my backup SSD for safety. It worked fine for the first few hours. The first and only issue so far was sleep and wake up. My previous build (10.13.6 on another SSD) had no problem of it, everything...

www.tonymacx86.com

Then Restarted and noticed there was no Checksum Error!

So maybe it takes more than 2 restarts or also needs fresh PowerManagement files. Sorry. Changed too many things to provide good troubleshooting.

“sudo nvram wake-failure=%00%00%00%00%00” worked on the 2nd boot as it only takes effect after the next boot.