Heads-up about EFI partition during updates.
Yesterday, when updating (not upgrading) to Sonoma 14.8.7, during the updating process, the OCLP EFI partition got affected, and would not boot anymore on the 2nd to last restart that leads to using the Mac briefly without root patches applied (that's when they get applied). In previous updates within Sonoma the entire updating process completed without issue.
Conveniently, I have a native Mojave install (last OS native to my Mac) on a different internal drive, so booted into that, and reinstalled the OCLP boot partition on the relevant drive for the Sonoma OS, and it booted again correctly, and finished the update, and worked normally thereafter (this is an amazing program).
First time this has happened, so wanted to pass that on.
So, the need to re-install the EFI partition is possible during updates, so best have a bootable OCLP USB flash drive or other alternate bootable external option handy if you don't have a 2nd internal OS installed.
MacPro 5,1, 2010-12