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Any suggestions to stop the freezes are welcome.

The system works better now, the glitches are almost gone, perhaps partially due to the SSDT-CPU-PM.aml created with ssdtPRGen. Some are still there, mostly when watching a video. There are suggestions to upgrade RAM which might help, but would not make sense on an old laptop. Sleep does not...

This laptop has no NVIDIA card.

After logging out and logging in as another user the flickering was almost completely gone, and it was still after logging back in to my user. But soon the GUI froze. Closing the lid caused a very short sleep. When I opened it again the desktop was back, looking very disturbing. Changing the...

After installing the security update 2020-006 the screen keeps flickering all the time, rendering the laptop almost useless. Before that it worked quite well when it did'nt hang. What was changed by this update?

This link, it had to read it more than once to understand it: https://www.tonymacx86.com/threads/an-idiots-guide-to-lilu-and-its-plug-ins.260063/

There is no need to patch the DSDT, it worked fine since Lion. Meanwhile I installed Clover on the SSD, or rather just copied the EFI from the boot stick. Now I can also boot the systems on the other drive. Sound works with a patch described in a Tonymac discussion, using Hackintool. I am still...

Clover, all the time. Is the DSDT useful? I have it since Lion, provided by someone who had the same laptop.

Meanwhile booting in normal mode works, ethernet with an old kext and WiFi with AirportAtheros40.kext, AtherosWiFiInjector.kext and HS80211Family.kext, all 3 were necessary. Even the brightness keys are working with that kext, they never did with Mavericks and earlier. Sleep is not working yet...

I risked installing High Sierra to the internal drive, of course after creating a new backup. But I could not boot into it because of the same error, should have deleted EvOreboot first. After many attempts I was able to boot into the external system again, in save mode, and deleted EvOreboot...

Following this guide I finally managed to reach the High Sierra installer and installed a test system on an external SSD. It was possible to boot into it despite of a lot of error messages. WiFi, Sound and brightness didn't work, so I put these kexts into the EFI: AppleALC BrightnessKeys...

Here it is zipped.

Yes, still the same goal, but it looks like this laptop is incompatible with higher versions of OS X beyond Mavericks.

I'm back and tried it again with an old version of Unibeast that was still saved somewhere. It failed to install the bootloader, so I installed Clover later. When I try to boot it the result is always the same. Here are pictures of the options and the kernel panic of my latest attempt. The same...

It's just funny that I can boot Mavericks from the flash drive that fails to boot the Sierra installer without kernel panic. But now I am preparing for a journey and have no more time for this, at least for several weeks.

This is the EFI that works with Mavericks.

The laptop has no BIOS with a lot of options. I can only change the boot sequence, set a boot password, which I didn't, enable virtualization and the HD is set to AHCI. The Clover version is 4045, after finding an old installer app from a different site. I already uploaded a screenshot of my EFI...

I attach a screenshot of my EFI folder and some pictures extracted from a video. The screen is a mirror, so I censored some pictures. The one I called boot fail shows a new effect, never experienced before. And it is all Clover, OC is deleted due to being useless on this laptop.

Clover, because OC failed, despite of studying the instructions for hours and following them in every detail.

I got a new SSD in my laptop, together with a hybrid drive, and restored Mavericks to the SSD. After that I managed to change the boot manager from Chameleon to Clover. Several attempts to create a working High Sierra or Sierra installer failed, there is always a kernel panic, apparently caused...