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Hi, But it works before ... I use this machine heavily everyday and really cautious to do any upgrade in case the upgrade will break my machine. Anyway, I manage to solve the problem by google and find the solution in the following link, in case someone having the same problem ...

Hi, b166ar Attached please find the zip file. Regards, Ahkeung

Hi, Problem again. The system hang after logon as seen in the attached png. All I can do is hardware reset and reboot. But I can never logon using previous user. Luck that I have another admin user created before and I can logon with that admin user. Any log I can check to trouble shoot this...

Hi, b166ar after setting the DVMT to 128MB for a few days, everything run smoothly and no more freezing of screen. Thanks a lot. Regards, Ahkeung

Hi, b166ar Thanks and will do and see if it is better. Regards, Ahkeung

Hi, I can not find any iGPU settings. Attached please find my bios setting image. Yes. And I do also spot the strange thing : system report show RX570 but Essential Script report RX480. Anything I can ensure the system is running the driver for RX570 ? Regards, Ahkeung

Hi, Attached please also find the system information of graphics part Regards, Ahkeung

Hi, Attached please find the EssentialsList result. Thanks for the prompt reply. Regards, Ahkeung

Hi, I've experienced system freeze when moving the mouse too fast for my machine (machine configu almost the same hardware to b166ar). It happen once or twice a day. Have to power off and power on to bring up the system. How can I debug this problem ? which log file should be investigated ...

Hi, Just one more question. I'm using Samsung SSD 860 EVO 1TB and Crucial MX500 1TB. Do I need to enable trim for this SSD in terminal using "sudo trimforce enable" ? Regards, Ahkeung

Hi, Problem solved as I just put the USB drive from front panel to back panel and everything run smoothly. No more "Stop Sign". Thanks b166ar. Regards, Ahkeung

Hi, I've tried the above EFI and still not work. When I reboot and Press F12 and select the usb drive to boot and a apple logo is shown on the screen with a progress bar going on and on and suddenly all the screen is black with a sign as shown in the attached jpg.. Regards, Ahkeung

Hi, Sorry for the confusion. My profile is a workable hackintosh and I'm going in to build a new one with almost the same hardware config as you. Thanks for the new EFI folder and will try tomorrow. Regards, Ahkeung

Hi, I use your EFI folder in my bootable drive and I can boot the USB drive and after the apple logo load (with the progress bar going and going...) and about 2/3 and the screen go black and no more HDMI signal is detected by the monitor... I'm using almost the same hardware config like you ...