We thought 10.15.6 would be the last major Catalina version with further updates limited to Supplemental Updates or Security Updates only. Today, Apple proved us wrong and released 10.15.7 update today! Safe to install on our Hacks without specific issues or surprises to expect.
A few of us with old C2D/C2Q platforms (mostly desktop) experienced CMOS reset since updating to 10.15.4.
During troubleshooting, the issue was pinpointed to 10.15.4's new boot.efi file (located in /S/L/CoreServices) which, as many of us noticed, was displaying some new info when booting in verbose mode.
Initially, replacing 10.15.4's boot.efi file with that of an earlier Catalina release or even an earlier macOS version was found to get rid of the problem without adverse affect on booting Catalina 10.15.4. However, this only worked for Hackintosh systems running Clover, not for systems running OpenCore.
File ownership needs to be re-adjusted to root:wheel upon replacement:
sudo chown 0:0 /S*/L*/CoreServices/boot.efi
Following further troubleshooting with vit9696, telepati and a few others, vit9696 worked out a temporary workaround for OpenCore in the form of a 5-bytes NVRAM variable wake-failure set to 00 00 00 00 00. All details and explanations are available here.
For Clover users, this workaround alternative to replacing boot.efi can implemented as follows in Terminal:
sudo nvram wake-failure=%00%00%00%00%00 Of course, this needs NVRAM to be working properly on the target Hack. For Hacks with no natively-supported NVRAM, it is required to install EMUVariableUEFI.efi Clover module + RC scripts on the Catalina boot volume. Once the variable is set and the system rebooted to take it into account, no more CMOS reset on rebooting from 10.15.4.
Bronxteck recently reminded us of links Apple publish in relation to creating bootable installers for OS X and macOS from El Capitan 10.11, so here's a link to the related main page:
Very useful as a replacement to the old AppStore method that allowed registered users to re-download an OS X/macOS installation package if they had already done so in the past.
12GB required for USB keys/flash disks.
Whilst the information is obviously meant for Apple Mac computers, it's nevertheless 100% relevant to the 1st phase of creating USB installers for Hackintosh computers, the 2nd phase being the necessary installation of the bootloader (Enoch, Clover or otherwise).