I have been using v2.08 with zero issues of any kind. No problems flashing the new firmware and no issues with Windows 11 activation being lost. Completed flash in Windows after setting BIOS defaults. After flashing, did full shutdown and turned off power to PSU.
I did not notice any effect related to my Hynix A-die overclock settings (neither worse nor better) and no changes to memory settings was needed. In terms of the CPU behavior, quick stability testing indicated this update is inferior to v2.08. I believe the new micro-code is the actual fly in the ointment, but selecting older micro-code didn't produce a noticeable change in anything.
Z690 Dark - 13900K - 5.7-P, 4.7-E, 4.9 Cache and 8200 memory, with TPM, Virtualization, TVB, Secure Boot, Intel ME, WiFi/BT M.2 slot all disabled (my 24/7 daily driver settings) and found that values used on all prior BIOS versions were no longer ideal with the new firmware. Tinkered a bit to see if there was any reason to keep using the new firmware, but didn't identify one.
- CPU required at least 0.050V more vcore and dropping cache to 4.8, but was still less stable (failed AIDA64 stress test and Cinebench R23 crashing using same voltage as 2.08)
- CPU ran hotter due to increased voltage needs (expected with the need for increased voltage)
- Boot time seemed a bit longer from cold boot
Went back to v2.08. Could not identify any benefit to using the new firmware. I had no problems that needed to be corrected using v2.08.
- I am not using, nor do I plan to purchase or have any need for, 24GB memory modules
- My A-die sticks are generic green Hynix modules (all manual overclock settings), so no XMP or Expo concerns to address
- Everything plays nice with my MSI 4090 Suprim X using old or current drivers on v2.08 so there was no need related to that
(Note: I have never tested sleep or hibernation on any BIOS version. I use my systems in one of two modes exclusively: everything powered on 100%, and everything powered off 100%. So, the sleep functionality doesn't matter to me.)
Love my Z690 Dark. My Z690 Apex is a pile of garbage in comparison to it. The Dark does everything better than the Apex.