[OFFER] Various Gigabyte Z170-HD3-DDR3 BIOSes with Coffee Lake support

@Semil24 Looks like you’ve worked it all out, good work! Enjoy your overclock

Hey @chinobino , yet another boring question…
Do You happen to know how difficult is the coffelake bios mod for an asrock z170 extreme6? I do have this board but it has a burnt chipset… I am considering getting it repaired as it has 12phase VRM so it should be able to take i7 or even i9

@Semil24 Modifying is easy using CoffeeTime but there may be a security check that stops you from flashing a modified BIOS using ASRock’s ‘Instant Flash’ - the only way to find out is to try to flash it.

If there is you can remove Instant Flash Protection by opening the modified BIOS in UBU and then exiting, UBU will ask if you want to remove Instant Flash Protection.

Hi All, I’m new to the scene.
I currently running Gigabyte Z170 gaming K3 with i7 6700K CPU & 16GB RAM. Planning to try Coffee Lake mod with 9700K . The questions I have are the following:
1) Will this motherboard be enough to support 9700K?
2) Regarding the pinmod: Am I correct in saying there is no need to short 2 upper pins for Gigabyte boards as shown in the diagram (Green colour)?
3) I’m planning to use CoffeeTime to modify my BIOS to support mentioned CPU. Are there any specific changes I have to do in CoffeeTime when it comes to patching…I also plan to use a CH341A Programmer to flash my BIOS (I understood that standard BIOS Flash utility won’t work) .
Btw I’m currently running latest BIOS F23f

Thanks in advance.

Hi, I am trying to mod z170 hd3p ddr4 for coffe lake (i3 B0) with coffelake, the process looks smooth, but after I have the modded file I keep getting ‘invalid file’ when trying to qflash it through built in Gigabyte qflash. Maybe someone can advise of the next steps or send me modded bios which will go through built in Gigabyte flashing software.

@majk3l Hi and welcome to Win-Raid forums.

The reason you can’t flash the modified file is because a single bit in the BIOS has been set telling Q-flash to check if the file has been modified.

You can change this bit using a hex editor.

There is a post here that describes how to disable the check.

Alternatively you can use the modified version of EFIflash in this thread to flash it from a bootable USB stick.

The BIOS updates are all showing the hosting website as being EOL and no longer available. would the Downloads be able to be hosted somewhere else and be reposted?

@FzRdd2f Hi and welcome to Win-Raid forums.

Thank you for pointing out the dead links, I have uploaded the files for the Gigabyte GA-Z170-HD3 DDR3 to a new host:



If these are not the files you need, you will need to tell me which one(s) you want.

Is there any chance to help me with this mobo ?
I have Z170-HD3-DDR and Intel i5 6500 non-k.
I managed to downgrade bios to F5a but it seems that previous owner upgraded IMEI.
Is there any chance to downgrade to make it great again ? I mean to allow me BLCK overclocking ?

@tomekmak You should be able to downgrade BIOS (including ME region) using Intel’s Flash Programming Tool (FPT):


I have written a guide on how to use FPT to downgrade the BIOS here.

Just remember that this motherboard has the Gigabyte DualBIOS feature which means that the backup BIOS chip likely has the more recent Kaby Lake BIOS (F20 or F21) with the updated ME firmware, so if your system fails to boot due to BIOS corruption for any reason - the backup may load without any warning and the system may not POST without clearing CMOS.

It is possible to flash the backup BIOS chip using EFIflash. I have posted a guide and download links for EFIFlash here.

Good luck!

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So i have to use FPT_v11.8.x.zip with orginal F5b bios file if i understood correctly ?

@tomekmak Yes, that is correct.

Unfortunatelly still not workning. Still can’t pass even 105BCLK :frowning:
In the evening i will try again from the scratch and post results.

@tomekmak You need to use BIOS F5b or F5c - you mentioned F5a earlier and it does not support base clock overclocking.

You can download F5b or F5c BIOS from this thread:

[OFFER] Skylake Non-k OC BIOS Archive

I have also included a guide in the second post for overclocking on Z170 Gigabyte boards.

What procedure do you advise ?
1st program both bioses using Efiflash then reflash with FPT or just FPT ?
(no intel ethernet on this particular board).

@tomekmak First use FPT to flash the main BIOS chip to ensure ME is downgraded and test base clock overclock is working.

Later you can use EFIflash to flash both the main and backup BIOS chips if you decide you want to have the same BIOS on both chips.

Test it only with bclk OC or in another way ?

@tomekmak Yes, you should be able to go over 105 MHz.

Wish me luck :wink:
Still @work :wink: 1h countdown :wink:

GL :smiley: