@90Ninety Hi, glad to hear it all works.
It does depend how you flash the modified BIOS, if you use Gigabyte tools (Q-flash or EFIflash) then the MAC address will not be overwritten, if you use Intel FPT or a hardware programmer then it will erase the MAC. I didn’t have time to make that disitinction initially but it matters not as you have flashed succeessfully. Enjoy your new CPU. 
The gigabyte ‘@Bios’ flash tool will not work with modded bios , it typically detects modifications .
Interestingly I flashed with Intel FPT , but MAC addresses must be intact , since both Ethernet ports work. I spent so much time concerned about this but , it seemed no way to write them other than AMI’s ‘DMIEdit’ which writes edits straight to the chip , rather than a .bin file , hence why I flashed a downloaded rom without editing the MAC
@90Ninety What command did you use with FPT? Did you flash the entire EEPROM?
I have used FPT v12.x to erase/overwrite the MAC address on my Gigabyte Z390 Pro WIFI, I am wondering if something is different with Z170.
@chinobino Hey everyone, I’m not sure if this will fit in here but I already tried to get an answer in other threads regarding this issue (apparently they are all dead lol).
I tried to run a Xeon Skylake (E3 1270v5) on my Asus H110T. However, I wasn’t able to do so with the modified BIOS. CPU-Fan spins very briefly when pressing the power button, but nothing else happens. Can someone help me out?
@lucagiolu Hi, I think you may have more luck using CoffeeTime v0.99 which has a GUI.
You will need to use the Corporate v11.8.77.3664 ME firmware version that comes with CoffeeTime or you can also try using the newer version modified by dsanke:
11.8.94.4494_COR_H_DA_PRD_RGN_Cut.rar
OR
11.8.95.4551_COR_H_DA_PRD_RGN_Cut.bin.zip
From this thread:
Which ME version for Socket 1151 Xeon CPUs on 100-/200-Series?
I actually already used the coffetime utility but in the guide only the Me Recovery Module needed to be removed. So thats the only thing I did. Turns out, I only need to carefully read the documentation and readme to achieve my goal. Replaced the ME firmware with the corporate version you already mentioned. After that, I set the ME state to “disable” (as described in the documentation to get xeons working) and also unlocked the FD locks.
And would you look at that, it boots!
Next step is to get an i9-9900 installed and working lol
Hey guys!
I’m new to this forum so be nice please - Or throw rocks at me, i will try to dodge!
Long story short: I dont want to update my whole System as i am happy with as it is, except for the CPU. I’ve seen online, that there a bios mods which allow us to use a newer CPU on old Motherboards. This is my Setup ATM (Just the important stuff):
i7 6700k
Asus Maximus Extreme 8
760 Watt Corsair AX760
Was anyone able to make this kind of combination work? Or maybe has a good idea on what to do? So far i’ve only found guides for AsRock or MSI Boards and many different statements on which CPU will work and which won’t.
Looking forward for a Pro to help me…thanks in advance!
@NeroTheDawn Hi and welcome to Win-Raid forums.
The Asus Maximus Extreme 8 appears to have a very good 8-phase VRM - which is a good start if you are thinking of running a 6 or 8 core CPU.
Asus motherboards usually have protection against flashing a modified BIOS so it is highly recommended to purchase a hardware programmer (such as the ch341a) to flash the BIOS EEPROM and to be able to recover from a potential brick.
You should also make sure you have a complete backup of your BIOS chip that contains the motherboard serial number and ethernet MAC address for the Intel Gigabit ethernet adapter.
You will need to modify a BIOS that has Kaby Lake support, so you will need BIOS 2202 or later.
You can use CoffeeTime v0.99 to easily modify the BIOS as it has a nice GUI and there are fields to insert the serial number and MAC address.
You will need to make sure that the ME FW is version downgraded to 11.7.1xxx (or 11.6.xxxx) and swap the relevant CPU microcodes depending on which Coffee Lake CPU you buy. Make sure to leave the microcode for your Skylake (506E3) or Kaby Lake (906E9) CPU for testing.
Coffee Lake CPUID:
906EA = 6 core
906EB = 2 or 4 core
906EC = 8 core
906ED = 8 core
If you need help with CoffeeTime or have any questions just ask.
Once you have backed up your current BIOS and made the modified BIOS you are ready to flash it to the motherboard. Note that using software to do this is extremely difficult on Asus boards as the Flash Descriptor is often locked and difficult to bypas (read this) so a hardware programmer is highly recommended.
Once the modified BIOS has been flashed you need to test it with your Skylake/Kabylake CPU first and then insulate the motherboard pins before inserting any 6 or 8 core Coffee Lake CPU. There is a diagram of the pins you need to insulate in the CoffeeTime folders (CoffeeTime_0.99\data\info). It is easiest/best to insulate the pads on the back of the CPU with Kapton tape.
You will also need to connect the 2 pins that tell the motherboard that the CPU socket is occupied, for which a car rear window defogger repair kit can be used (although you can use graphite from a lead pencil for initial testing).
I tried to find a ch134a programmer, but when i google it, i only find the ch341a - will this one work as well? Is there anything i have to be aware of when buying one? I am currently looking for a i9 9900k as it seems to be the most powerful version that i can find which should work.
Thanks by the way for the REALLY informative answer, it really helped me and i will surely give it a try!
@NeroTheDawn Hi, yes I made a mistake - I should have said ch341a, my apologies.
Here are some good guides for the ch341a in case you are interested:
[GUIDE] Flash BIOS with CH341A programmer
[Guide] How to Use a CH341A SPI Programmer/Flasher (with Pictures!)
I can’t say for sure that your motheroard will be able to run the 9900K with all core boost @ 5GHz, as it will depend on the ability of the VRM circuitry and the heatsink to keep it cool, however if there is any Z170 board to try it on yours would be at the top of my list (as the VRM and cooling looks very good).
what is PCIE patches?what is that on coffeetime?
It’s been a while since visited here last time. Anyway I got bored and found an Asus board (H110M-K) board from my stocks. Although the board has a weak VRM-section it’s probably fine with stuff like i5 8400/8500 as long as everything is kept at stock speeds.
I used Coffeetime 0.99 to mod the latest official bios update with ME 11.6.10.1196 (mod.rom) and added board specific data (SN,UUID etc.) to mod.rom by using F4DD editor.
I unlocked FD/ME write protection according to this guide. Then I flashed mod.rom to SPI by using AFUWIN 3.05.04 with /GAN command as I did years ago with another Asus board. After that I dumped the newly flashed image file (dump.rom) by /O command and this is what I got
So it looks like that either AFUWIN is incapable to rewrite the FD-region or Asus bioses have separate lock for descriptor. I highlight that ME itself has been changed (originally it was 11.8XXXXX).
I am pretty sure that the mod works fine with B0-revision CPUs but since SKU-modification is not present in the dumped image the system won’t boot with U0 rev. stuff. To be fair, I haven’t yet tested the system with any new CPU.
Other possibilities are to use Intel’s FPT to rewrite FD-region or flash mod.rom with a CH341A -programmer. For the latter option the bios chip is socketed (Winbond 25Q128FV) and I have a programmer but not sure if it’s safe to use. Data lines draw 5V and instead of CH341A it has marking CH341B on the controller chip.
EDIT: As I suspected FD is locked separately. FPTw64 was able to re-flash ME-area but not FD
Error 451: The host CPU does not have write access to the target flash area. To enable write access for this operation you must modify the descriptor settings to give host access to this region.
FPT Operation Failed.
Apparently launching GRUB from efi.shell and then off-setting the re-flash variable only unlocks ME-area in this case.
