KB3064209 breaks the G3258

no news here? still no bios for win 10 with overclock enabled?

I am sorry to have to say this but there will not be a BIOS update to allow for OCing on non-Z platforms under windows 10. This restriction comes down from intel and is not the fault of ASRock or any other manufacturer. Intel is within its rights to set parameters for how it's products are implemented. 

The G3258 is a great little CPU, I am using one as I type this overclocked to 4.6ghz on my ASRock Z97 Extreme 3. The problem is that despite its phenomenal overclocking and single core performance, often matching or bettering an i7 4790k in this regard, it still only a dual core CPU with no hyper threading. While this is more than enough for most applications it has become a problem with new AAA titles that require more than 2 threads. An AMD Athlon 860k and a decent FM2+ board will perform better in a gaming scenario when paired with a decent GPU. I would recommend the ASRock Fatal1ty FM2A88X+ Killer or if you are on a tighter budget the ASRock FM2A88X Extreme 4+. Both of these offer great features, superior power design than cheaper options and likely better overclocking capabilities than you would find in the budget segment. I recommend the Athlon over the APUs on the FM2+ platform only because they are cheaper than an A10 XXXX and lack only an iGPU which you will not need with a discrete GPU installed anyway.

If you want to use Windows 10 on a H81 board  ( with overclock on g3258 ) you can do the following.

1. UPGRADE to windows 10 from windows7/windows8. For some reasons, upgrading, even if you check the "keep nothing" option, will not disable to overclock, will not cause black screens or any other errors.

2. Disable the overclock or disable 1 core or both of them. Install Windows 10. Search for "mcupdate_GenuineIntel.dll" in system 32 and rename it in "mcupdate_GenuineIntel.dll.old". To rename it, you need to change properties, go to security>advanced and there you will need to change the Owner. Click "Change", go to advanced, go to "Find Now" and double click on "Users" from the drop down table ( it should be before the last ). Now go back to Security and in the "Group or user names" tab click "Edit" on any of the listed groups/users. Check "All"  for administrator and users in the new tab that you are prompted. Reboot. Enable both cores and you can overclock now.

Don't use the latest BIOS, because the microcode disables the overclock option in the BIOS.

Hello.. Thanks Asrock for all help you give.
can you help me just in more this case, please?