@geiti94 I suppose, that you didn't flash locked regions like FD and ME (exactly from modbios). So you need full reflash the image for trying mod. Anyway, this mod method might not work for ASUS Z270 even if you will flash it correctly. If you modded last bios version - low chance for success. For 0906 version - it's about 50/50. Best way for your M9C - is porting bios from M10C.
@Datlore001 You are welcome. If not all noticed pins will be isolated, then it can damage board's VRM. Also, you can physically remove all required pins in socket directly. And keep in mind, there is weak VRM on this board, so overclocked 6-core easily overheat it over 100c.
@mtothaj Patch of CpuMpPei module is responsible for number of initialized threads (8 at default). For some ASUS boards this modified module works correct (e.g. Maximus VIII series), but for others it doesn't (e.g. Sabertooth, Z170iProGaming). If this module doesn't exist in bios (bios below 3000 version at most of 100-serie boards), then even 16-threads cpu works without problems. This trick described in CoffeeTime.
@Spongyi Just make mod bios for your board with CoffeeTime and flash it through FPT. No any problems expected. Download link posted earlier at this thread.
@yeumanu Yes, this ME isn't compatible. But it isn't problem for Gigabyte, you can easy change it with FPT flashing software. Just need to correctly flash the bios. Pinmap for isolation on Gigabyte and ASUS you can find here. And yes, for use G5400 on Gigabyte you need to isolate ALL red and blue indicated pins.
@yeumanu If you want to get advices, then maybe you should follow the recommendations? Check your ME version on both boards with previously attached tool, it takes 1 min.
@Lost_N_BIOS TPU firmware comparison happens every time when board starts, not when flashing. If it fails board hungs on update procedure and next bios reflashing not more helps. The decision for unbricking - is directly reflashing TPU chip.
@Datlore001 Gigabyte Q-flash has some updating restrictions, better use FPT or AFU. There are no any locks on Gigabyte so no problems with these tools.
I wouldn't advise to use internal flash tools. Yes, unlock FD and ME with SPI once and you will can use FPT/AFU for every next reflashing. Just keep every new bios unlocked too to not repeat unlock actions again.
@PCGH_Torsten Ranger and Hero: no start => no payload => alive pins. Sabertooth series really may be different of all. I received feedback about Z270 Sabertooth whose iGPU not works with common mod (it can be user mistake, but still). You can expecting anything from ASUS...
@6I9 Yes, I use this modbios with 8600K for now. All mods are included, supports all Sky, Kaby, Coffee, Coffee-Refresh. Don't forget about mass pin isolation and watch out for VRM condition.
@PCGH_Torsten Thats a riddle from ASUS. CpuMpPei module not exists in most older 100-series bioses and this is allow to support under 16-threads. If module exists - result of patching seems a lottery. If your single board not melt pins or smthng else (anyway check it twice) - you're lucky, it's special case. Pinmap was made universal for each brands and compiled as minimal required for safe using. Of course, you can recheck it if your hardware isn't valuable. About Gigabyte: Yes, without wide isolation it burn out one of VRM phase. Probably, board still will work. Pin L31 was melted on my own Gigabyte board due to sliping tape.
@PCGH_Torsten Excellent! That's because most of old (under 3000) 100-series bioses hasn't module, responsible for 8+ threads initialization (CpuMpPei). For ASUS, for some reason, mod of this thing isn't work predictably all of the time. This trick was found and described by @dsanke .
@marek Required mods, work with socket pins and flash method are depends of target CPU revision, threads count and board vendor. Use CoffeeTime for easy biosmod and info recieving. U can find link in posts higher.