@chaplin_lee I wrote some detailed instructions when I got the i7-8700 working on my ASRock H110-M board. See my posts #122 and #178 in this thread. And other posts by me and other people in response to those. I wasn't correct the first time about a lot of things, but I put in details that nobody did, so maybe it will help you.

First, though, did you short the two pins (see the posts above). You have to mask some pads for all coffee lake, and short two others for the 8500 and 8700 (six-core) CPUs. Read my posts and search this thread for mention of the HWBOT forum and posts over there that were started by Splave. There are pictures of what you need to short, and how. And I posted some pics of the pins that I melted on my motherboard, yay! I did not mask them as I should have. It is working right now, so I guess I never needed them.

I finally received my 9900k and tried to get it going on my ASUS Maximus IX Code motherboard with minimal success. I have been reading up as much as I can within the forums and ran into some issues that maybe someone more knowledgeable can help me solve. I did the following:

- Connected the pins on the motherboard and isolated the pins on the CPU. Used the info from a thread about the ASUS Apex board and used a multimeter to make sure the CPU pinout corresponded to the same area on the motherboard as they are different. It looks like they share the same bios so I did that mod too although I honestly don't have a clue of what the purpose of it is.

- Started with the newest bios for the iX Code from ASUS site and then ran it through [TOOL] Easy automated Mod tool for Coffee Lake bios. The tool worked flawlessly but the board wouln't take it. Got some help from @Lost_N_BIOS as he corrected some stuff but even then, the USB Flashback wouldn't take the bios file. Then I tried just flashing an OEM file and that didn't work either. The flash utility in the bios would flash any OEM file without a hitch but the flashback wouldn't work.

- Read through more threads on the forums in an effort to sort out my USB flashback problem, and ran into a post somewhere stating that hyper threading wouldn't work unless a newer gen motherboard bios was modified to make it work. Luckily, I ran across a thread where @brams had done that exact thing and was fortunate enough to get a copy of it from him, as well as a considerable amount of help that I didn't even know I needed.

- Retrieved the UUID, Serial Number and MAC address via Intel FPT and used the FD44Editor to copy it over to new bios file I got from @brams

- Turns out my ME was too high at 11.7.0.229 and I guess I needed the 11.6.0.1126 that was present in the Maximus Code X bios that was modified. To do that, I had to pray to a higher power as using UEFI grub and then FPTW64 while elevated in Windows did not work. Did everything I could to get it to work but failed over and over and over again. I must have repeated the process in excess of a hundred times. Read through a thread that explained different options available and I just went down deeper into the rabbit hole. Probably spent a good day trying and I don't know what happened or what I did differently but eventually persistence paid off and somehow I was able to downgrade it via FPTW64.

- After the BIOS finally flashed, there was a good five or six very nerve wrecking reboots before the UEFI finally fired up on the 7700K. I wanted to make sure everything still worked with my "old" stuff before trying out the new processor. Turns out the motherboard was showing a high voltage for the CPU at over 1.5V and manually changing it did nothing. I booted into Windows and used hardware manager to keep an eye on it and it looked normal. Voltages were somehow in the 1.1 to 1.2 range and CPU temps were within range. Not really sure what's going on there either but I wasn't a fan of it either way. I don't want to burn out the old CPU and definitely don't want to hurt the new one.

- After all that was done, I finally decided to throw in the 9900K in to no avail. No matter what, I can't get the motherboard to post. It turns on for maybe a second and shuts off almost instantly. There appears to be a little tiny red LED that turns on that is labled CPU and that's when the motherboard shuts off. Since the pins are shorted (on the motherboard) and the other two pins are blocked off with Kapton tape, I'm not sure what the problem is. The ME is downgraded so that shouldn't be causing the problem and that's where I'm lost.

Could someone take a look at the BIOS file and see if there's anything obvious or not so obvious that was missed or omitted?

I would also like to thank everyone in these forums for providing the resources and making them available to us. And a special thanks for those who have helped out on this journey so far @Lost_N_BIOS and @brams Both of you guys rock!

Here's the file: http://s000.tinyupload.com/?file_id=96375957719417370084

Joining in on this: I did not try MIXCode, yet, but Maximus VIII Ranger and Hero. Flashing was not an issue for me (well - did take some time until I found out how to flash .bins from SKU-mods and automated mod tool), but no matter how I modify the UEFIs, I only get 1 sec "00" and immediate shutdown. The pin mod (I only shorted as there were no reports of isolating being necessary on M8R/M8H) does work, though, because without the board would not switch on at all.

Sample from my UEFI tries:
http://s000.tinyupload.com/index.php?fil...469531399341112
Asus UEFI 3802 for Ranger with Video and GOP update according to guide; Microcodes 506E3 for 6500K + 906EA/B/C
http://s000.tinyupload.com/index.php?fil...624177126061695
The same, but with SKU changed to Z370.
http://s000.tinyupload.com/index.php?fil...730491755466556
M8R8: Asus 3802 modded with revlaays tool + 906EC added with UBU.
http://s000.tinyupload.com/index.php?fil...764081323987149
M8HA: Asus 1001 for Hero with GOP-update and Microcodes 506E3 and 906EC. Uses IME 11.0.0.1168, while all Rangers are 11.6.10.1196

Neither of these does work (with CFL - SKL is no problem) and I hate not having a single clue why they don't work :-(

@Deez and @revlaay - I often wondered why ME version was 11.7.0.229 in this tool, and in the past had always/only seen many users using 11.6.0.1126 or other similar. May be the solution for @mini-stx too

The actual ME version is 11.7.0.1229 and has proven to work.

Anything with 11.7.0.3xxx or above will fail.

Thanks for the confirmation @chinobino - is that confirmed for any/all cases now, and use of 11.6..x.x is no longer needed ever?

The source of the info is HWBot, dsanke used it with ASUS ROG MAXIMUS IX APEX.

[Edit] Looking for links

Has the inverse been proven as well:
Is anything below 11.7.0.1229 unsuitable for CFL-8?
That could be the reason for my failure (I do not have a CFL-6 ready for testing). I thought that only too new IMEs would prevent boot, so I tested with the oldest I could get my hands on without downgrade modding.

Yes, but maybe that does not apply to all cases, or has there been no other reports of issues on boards edited with that one since? Also good question @PCGH_Torsten

Zitat von Mov AX, 0xDEAD im Beitrag Fixing PCI-Express for Coffee Lake CPUs on Sky/Kaby Lake non-Asrock(and some new Asrock) motherboards

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ME versions 11.8.x.xxxx and 11.7.x.3xxx block coffee CPUs on pre-z370 motherboards, downgrade ME partition to 11.6.x.xxxx/11.7.x.1xxx

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Is there any list of working motherboards ? Would it work on h270 asus prime plus ?

Currently there is no list although there does appear to be a lot of problems with ASUS motherboards.

If you have an ASUS ROG motherboard there is little chance that an automated tool will work, each motherboard model requires patching to different areas of the BIOS.

Also, a lot of the ASUS motherboards have additional IC's with specific functions (e.g. TPU, EPU) that require specific ACPI patches that someone needs to map out...

I have attempted to mod the 1205 BIOS for the ASUS PRIME B250M-A without success, running into ACPI issues that I can't resolve, the H270 ASUS Prime Plus is very likely to have the same problems.

The 'simple' (and often cheap) motherboards seem to have the most success, i.e. the ones that don't have a complex BIOS and extra features e.g. ASUS Z170-A, ASUS Z170-E.

On HWBot Alex@ro managed to get the ASUS ROG MAXIMUS IX APEX Z270 working with 8600k/8700k with BIOS mod but no HT working.

Later jjxaker got HT working by intergrating parts of the ASUS ROG MAXIMUS X APEX Z370 BIOS for the 1602 BIOS.

So it can be done - it just takes a lot of time and effort.

Is anyone aware if the z270x gaming 7 will run with the 9th gen processors up to a 9900K? I currently run a 6600k and I haven't bought a 9th gen processor yet, Although there's no guarantees is the mod find with my board or anyone who's tried it?

@Xx Tek Tip xX I just modified the F9E BIOS for the Gigabyte Z270X-Gaming 7 and didn't see any issues, you just have to make sure that you isolate the CPU pads.

Zitat von chinobino im Beitrag #582

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Currently there is no list although there does appear to be a lot of problems with ASUS motherboards.

If you have an ASUS ROG motherboard there is little chance that an automated tool will work, each motherboard model requires patching to different areas of the BIOS.

Also, a lot of the ASUS motherboards have additional IC's with specific functions (e.g. TPU, EPU) that require specific ACPI patches that someone needs to map out...

I have attempted to mod the 1205 BIOS for the ASUS PRIME B250M-A without success, running into ACPI issues that I can't resolve, the H270 ASUS Prime Plus is very likely to have the same problems.

The 'simple' (and often cheap) motherboards seem to have the most success, i.e. the ones that don't have a complex BIOS and extra features e.g. ASUS Z170-A, ASUS Z170-E.

On HWBot Alex@ro managed to get the ASUS ROG MAXIMUS IX APEX Z270 working with 8600k/8700k with BIOS mod but no HT working.

Later jjxaker got HT working by intergrating parts of the ASUS ROG MAXIMUS X APEX Z370 BIOS for the 1602 BIOS.

So it can be done - it just takes a lot of time and effort.

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