@Lost_N_BIOS : It means, that i had in my mind, that it should be possible to replace B1DA0ADF-4F77-4070-A88E-BFFE1C60529A (Setup) as whole and 99FE-43D8-9A21-79EC328CAC21 (AMITSE) as whole.

ok... your mod BIOS gets stuck at bootlogo too.

could this be RAM issues? i have DDR4 2400. I9 9900k wants DDR4 2666. Or will i9 run with 2400 too? Had read some post according this, where they said, it should work. Any experiences here?

@reactive - Can you boot to BIOS? If yes, then no issue with the mod BIOS, problem is with HDD/SSD/OS or OS settings possibly since you reset the BIOS
If you want to be 100% sure BIOS is fine, program in creisey's BIOS as quick test, since we know already that is 100% tested and working. If it works but the one I made you does not, let me know and I will transfer your details over to that BIOS instead
Did you do the power drain/wait thing I mentioned? If not, do that now and try again.

2400 memory will be fine, it should boot at 2133/2400 by default anyway usually.

Do you have other Coffee CPU you can test with?
Maybe it's just issue with i9, I see in this guide at 4.1 that Asus has issue with some BIOS and i9 unless Z370 BIO port is used - https://forums.overclockers.ru/viewtopic...602278&start=60

@Lost_N_BIOS : on 7700 i can boot into bios. Loaded defaults and set AC / DC Loadline to 1 and disabled Bootlogo. But on 9900k still nothing.

Meanwhile I thought vbios in padding could be an issue and replaced it by the vbios you inserted, but that did not solve anything. 7700k ok, but 9900k not.

I did that powerdrain and wait thingy, additionally system was powerless while programming.

i programmed creisseys bios too, but had exactly the same issue.

@reactive - see my edit above. So with 9900K you can't even boot to BIOS? If not, then it may be as I mentioned above in edit. Is there similar system as this one but Z370 board? What is the actual board marked as inside there?
No, vBIOS is fine that way, I noticed that is never changed by either coffee tools, and BIOS always works, the actual vBIOS is inside main BIOS DXE at last module.
Since you tested creisseys BIOS I made too and same, I bet this is as I mentioned in my edit above, we need Z370 backport from similar board, or you'll have to put that CPU in something else and pick a different model for this system

@Lost_N_BIOS : no i do not have another coffee except in my cup of coffee... ha ... ha...

that CPU should be fine. it is a brand new.

the mainboard is marked as ASUS G20CI.

I do not have access to a board in which that cpu would fit.
-------------------------------

@Lost_N_BIOS : your link to overclockers does not work for me

@reactive - CPU fine is not the question here, although new does not = fine/functional always. The issue is CPU is not fine with this kind of mod, due to the silicon and your board/BIOS.
Did you see 4.1 in the link above, look at the image for i9 8/16 CPU's, it's a no on x2xx boards without a suitable Z370 backport. Ohh, you can't view, here, try this google translate link, if this also fails, you'll need to use a webproxy like kproxy
https://translate.google.com/translate?h...78%26start%3D60

You may have to pick an 8c/8t i7 or lesser for this system, due to the chipset/BIOS and being H series does not help either due to the lack of power phases

Look at the motherboard, what is the Asus model printed on it? So I can check if similar H370 board would be suitable to test backport BIOS from

@Lost_N_BIOS : my adblocker blocked the site. ok... they say no. Even with HT disabled? I will try.

the only Model labled on the motherboard is G20CI it is a special formfactor. There will be similar boards, but that must be found.

this guy made it: https://rog.asus.com/forum/showthread.ph...Lake-Processors

@reactive - HT disabled may help, or CMOS may reset anyway due to new CPU, so without further BIOS mod I don't think that is possible to test either

Interesting! Ask him for that BIOS, then we can put in your details. He must have found compatible BIOS to backport from.
He's leaving a lot out there, you can't just downgrade ME and insert microcode and Coffee work
Also, he is using 9900K P0 CPU which may matter as well.

I will make you BIOS with HT Hard Disabled, will update here with link, watch for edit.

@Lost_N_BIOS: Disabling HT definitively helps it now BOOOTs to bios. Disabled it via bios on 7700k. ok, i will now put all together and do further tests. PM that BIOS so i can flash it, when i try further tests with HT on and no boot happens. it makes it easier, than handling with a cpu with liquid metal on it. I assume u use AmiBCP to disable HT? than i can do it myself

@reactive - Ohh nice, so you got in there, and don't need further HT Disabled BIOS! I was almost done too
I came here to add, if this HT hard disabled BIOS fails also, next thing we could try would be stock BIOS edit with your info inserted, sometimes some Asus BIOS need stock BIOS used as Coffee Mod Source.
No, I do all edits manually, and edit much more than AMIBCP edits when I do a hard disable of any setting. I change setup default, ALL NVRAM defaults including internal and shadow copy in PEI volume, and then AMITSE/SD which AMIBCP changes (along with some NVRAM)
OK, I will finish this edit and PM it to you << * Edit @reactive, BIOS Sent in PM * Re-sent

@Lost_N_BIOS :

thank you very much.

Ok, for all others having a G20CI and think about a 9900k, keep in mind, that it wont boot with HT enabled. Someone said it wont run stable, it simply does not boot. This might be a power issue of the VRMs or the need of a backport from a Z370 Bios as Lost_N_BIOS mentioned. But i think there should be a hardware hack possible.

I havnt made a picture, but there is a complete VRM unpopulated on that board. If that could be populated (many resistors, capacitors ... needed) then I think HT could work in theory.

@reactive - you're welcome! Sorry we could not make it work fully.
Maybe best to pickup 8C/8T CPU for this system, or you could try 6C/12T "maybe", and then move this 9900K to another system (or sell it), that way it's not being wasted cut down to 8C/8T in this system

@dsanke @chinobino - Is there any known fix around I've not heard of yet, to allow 9900K run with HT on Asus H270 chipset?
I assume maybe port some H370 or Z370 BIOS, but reactive says the board in G20CI is abnormal design, so probably none similar in regular desktop models.

@Lost_N_BIOS : when changing settings in BIOS on screen, where are these settings stored? In Flash or someting else? I am asking, because I want to try several things, like undervolting, 6c/12t and so on. Does your hard HToff allow me to enable HT through BIOS? When it fails, does it automatically disable again?

According to Backport. I made it for the G20CB. It can work, but mostly I had issues with that SIO chip (nuvoton). I got several BIOS from Asus with. One version I made worked with my SIO chip. But since I lost every single bit of what I made, it is difficult to do it again for another bios...

@reactive - Yes, you can enable HT with the Hard Disable BIOS I sent, it's just disabled by default so you can start that way if/when needed.
It's the default for that BIOS too, so anytime you load optimal or fail safe defaults that will = HT Disabled, in case you enabled it and then can't boot, clear CMOS and it will be disabled again
So to try 6C/12T with that BIOS, you can set six cores enabled only, then reboot, and enable HT. Then it it fails to boot, simply clear CMOS to re-disable HT again (ie load fail safe) << That only applies if you use the BIOS I made you with the HT Hard disabled.

Live/Current/In-Use BIOS setting changes are stored in NVRAM (the one or two volumes at top of BIOS region)
Fail-safe/optimal are either pulled from internal NVRAM (near AMITSE), Shadow NVRAM copy in PEI region (usually a padding or random GUID module there), Setup, and or AMITSE/SetupData
I don't know for sure which this system uses to pull defaults when reloading, and all boards differ, it would take a lot of testing for you to find out which is used for such and that may not apply to all settings either.
When I change a setting to what I call a "hard" change, I change whatever setting user wants to be, to be fail safe/optimal default and or live/applied/current in all these locations, so that by default the only applied value is what they wanted to be default/applied no matter what (until user changes directly)

@Lost_N_BIOS : ok, that sounds good.

Thanks for the explanation.

I have one issue selecting the amount of active cores. The dropdown menu to enable cores only offers "All, 1, 2, 3" . Is it possible to "hack" that dropdown menu to provide 8 selections?

btw. i am digging into a hardware hack to extend the VRM capabilities to lower the VRM temperatures and get more perfomance. Mounting heatsinks helps, but not in the case you want to draw 100A instead of default 79A to get normal Turbo Performance. Saw some pictures on the web from G20CI Boards, showing that each VRM lane (maybe Core VRM) has only 1 FET. The second in parallel is not populated. I have several ASUS boards containing all necessary components to populate more MOSFets. In addition with heatsinks i expect it should perform better.