BCLK is not working, it show 110mhz on bios but on HWinfo64 shows 99~100mhz. Maybe a external clock generator is need it. Don't know.

Great news!! OK, so now we know probably must be ME 1191 or above! I don't know about bclk overclock, but if you can find others saying certain ME allows it in these situations, we can try a mod with that ME next.
There is a few more ME versions right after 1191, if you want to try one or more of those next I can make you more BIOS to test. To see if your mod methods are OK and working, you should try same mod on your end with this same working BIOS and same 1191 ME (But clean ME yourself, to verify your way works)

Did you test 7.20 BIOS too? They may work, I only thought maybe not, but it could be OK. Try the 7.20 1191 BIOS and see if it works, maybe better for overclocking attempts

Only x8 CPU? Or is this with C1E/Speedstep stuff enabled so it's downclocking?

Didn't test the 7.20 version. I have to see what ME version is allow to BCLK OC. It's the Speedstep, Turbo Clock is working too. 4ghz on one core, 4 core 3.7ghz.

At least turbo is working, that's good! Yes, try 7.20 1191 now, maybe better BIOS since many improvements have been made, lots of BIOS changes between them to make things run better I'm sure.
If it fails, then we know 7.20 is not compatible with older ME. Be sure to flash using suggested method again when trying next.

7.20 has C2 mCode and C2 if i not wrong BCLK OC don't work unless the mobo have a external clock generator, i not sure. I will the 7.20 just to see if is gonna work.

Working with 7.20 BIOS ME 11.0.0.1191!

Thank you,Thank Lost_N_BIOS.You provided a different and important idea of moding 100/200 MB bios for E3v5.

I think in get a MOBO with external clock generator and test OC capability. ME disable probably mess with the BCLK OC.

@Fileko - great you can use latest BIOS now too! Always good when you can use newer BIOS usually. Now, we need to find last ME version that is working maybe, do you think only certain ME is good for Bclk overclock?
I think you are right, probably need external clock gen for bclk overclock, along with other things needing to be correct. I think I remember reading that, on the older main Bclk overclock only threads, unrelated to this type of BIOS mods.
Did you compare my ME with your modified ME, via FIT XML? Maybe how I do is different, so it works, and maybe 11.6 ME would still work if I did the mod with it? Or maybe @htpcfans is correct, only 11.0.xx works for this mod.
If that is true, there is still much newer 11.0.xx ME that we can put in, instead of 11.0.0.1191. Latest one in repository is 11.0.25.3001, if it has to be 11.0.0 then there is still much newer 11.0.0.7101

Why in Cinebench is this Xeon 4C/8T score lower than Celeron 2C/2T G3900? How is that possible?

@htpcfans - You're welcome! What did I do differently that you notice? I did mod manually, with clean ME and transfer from mainboard SPI backup (Could be done from stock board image too).
I thought maybe the issue was either wrong ME, using some other boards exported ME, or not cleaned and properly setup ME.
I can give method, steps etc if you need, let me know.

If i'm not wrong the last mCode revision that supports BLCK OC is the 74 unless the mobo have external clock gen, but i not sure about that. Probably , but i don't know last ME versio that allow BLCK OC. No, did you change others setting or just the "Reserved"? If you want to build some BIOS for test, like one with 11.0.25.3001 and one with 11.0.0.7101, o could test those. That is singlecore score, and the Celeron was clock at 4.4ghz when the Xeon was at 3.8~4ghz.

@Lost_N_BIOS Do you think is it possible to change the BLCK of 100mhz to say 120mhz in the ME Region? There is option ''Integrated Clock Controller'' in FIT, maybe we could change that, to 120mhz ish. What do you think?

I only changed Reserved setting, all other settings were left default/as they were from transfer of your other ME/BIOS. OK, I will make you some more test BIOS tonight to play with and see if either is OK or not.
I didn't check right now, but will tonight, is mcode 74 in there now, or do you need/want to go backwards to 74 on that too if not there already?

Yes, you can change default bclk setting like that in ME but I have never did that. 120 is very high, maybe test 105 and 110 first?
I will make you test BIOS on those, with exact same versions you already verified working above, that way if it fails you'll know it's only due to these changes

So version 2.20 has mCode 74 and the 7.20 has C2. 120 is not that high, i did used 160mhz to get 4.4ghz on Celeron. That was with no mod, the original 2.20 BIOS did allow BLCK OC.

So you're confirming, as far as we know now, mcode 74 = bclk overclock but only in original 2.20 BIOS, but not in updated ME /reserved ME 2.20 BIOS.
I think that is correct summation, if so, then ME = reserved effectively disable ME kills Bclk overclock, so you can't have both this mod for Xeon and bclk overclock.
Bclk overclock test is needed now on stock 7.20 BIOS, so you know if it works there with ME enabled and the updated C2 microcode. But I think all this moot point due to below thoughts.

So, if ME set bclk above 100 doesn't work, then it's not going to be possible since it's controlled/allowed by ME and you want ME disable too.
That also make me think, no matter what we set bclk to in ME it's not going to matter, since we are disabling ME, but it's worth a test to find out if this is true or not.

Well i don't know, maybe the BLCK is set before the ME is disable?

Edit: I did try to change the BLCK under FIT, but it does not go more than 100mhz. Maybe not possible?