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Regarding 840-00840-A that I mentioned in my first post. After CPU replacement, I flash this attached bios and it will get stuck on apple progress bar. If I boot in safe mode. It boot completely. When I login on MacOS. I get this message about IGPU. See attached Maybe graphic is not working...

sorry for that. here the original one. https://file.io/ZR6rOpXsQSrN

I flashed the bios you send me. When I boot via usb, It show apple logo and progress bar seems to complete then blank screen, only backlight work. It will stay in blank screen forever :(. It doesn't shutdown this time. Cap lock not work.

ya

okie will do thx. thanks. i will try today.

I am not able to find confirmed me region on this forum. Maybe someone could post me a link. thanks in advanced.

attached bios for reference. we never had me region issues. But i will try to get the confirmed on the forum and try. attached original and changeme bios we have used. https://file.io/9vWJRAKghhw5

we use a tool called LBE ++ see attached.

I tried to boot MacOS in verbose mode. It seems to complete the boot up process and this time it get stuck in blank display with backlight on. It doesn't shutdown.

Hello, Thanks. I have done ME region and NVRAM reset. It start with apple logo, show progress bar then after 2min there nothing on the display, only backlight is on and it turn off. (during all this process power supply showing 540 - 600 amps. Of course Ubuntu boot in 55 seconds :geek...

Hello guys, I am working on a Macbook air 2017 Logic board 820-00165 with 1.8Ghz cpu. The board came with Vcore shorted. I decided to replaced the CPU (cpu taken from other board) and the board boot, see wifi, but will not boot into MacOS or boot in Recovery. It start to load then turn off...