XanthraX Posted September 16, 2025 Share Posted September 16, 2025 Hi friends, I am not capable to make by myself a config.plist for my Z370P D3 mobo, for the iMac 20.1 SMBIOS. The models for iMac 20.1 available for OCAT require a 9th Intel generation CPU. Is it someone who could make a config.plist for this combo? Or I should stay stuck with Sequoia? Thank you in advance. Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/ Share on other sites More sharing options...
MaLd0n Posted September 16, 2025 Share Posted September 16, 2025 EFI XanthraX.zip -Delete old EFI folder and paste new then empty trash. Don't use merge files. -Don't use Drag and Drop into EFI partition. Use Copy/Paste instead. -Reset NVRAM one time - with OpenCore use entry "Reset Nvram" / with Clover use F11 key on boot screen. 7 Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2840727 Share on other sites More sharing options...
deeveedee Posted September 17, 2025 Share Posted September 17, 2025 @XanthraX Is it really true that OCAT requires 9th Gen Intel for iMac20,1? Why would OCAT impose that limit - doesn't make sense. I don't use OCAT, but if it really is restricting SMBIOS based on CPU, there's something wrong with the tool. 4 Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2840799 Share on other sites More sharing options...
bluenote56 Posted September 17, 2025 Share Posted September 17, 2025 On 9/16/2025 at 2:41 PM, MaLd0n said: EFI XanthraX.zip -Delete old EFI folder and paste new then empty trash. Don't use merge files. -Don't use Drag and Drop into EFI partition. Use Copy/Paste instead. -Reset NVRAM one time - with OpenCore use entry "Reset Nvram" / with Clover use F11 key on boot screen. It worked for me thanks 1 Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2840803 Share on other sites More sharing options...
Anto65 Posted September 17, 2025 Share Posted September 17, 2025 No, it's not like that. OCAT doesn't impose anything Even on the most trivial things that are taken for granted. ic005K always leaves the decision up to the user. When choosing the Smbios for example, indicate the CPUs that could be referenced, but it is not necessary to have that CPU... select the Smbios that you consider most appropriate. Spoiler 6 Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2840804 Share on other sites More sharing options...
bluenote56 Posted September 17, 2025 Share Posted September 17, 2025 14 minutes ago, Anto65 said: No, it's not like that. OCAT doesn't impose anything Even on the most trivial things that are taken for granted. ic005K always leaves the decision up to the user. When choosing the Smbios for example, indicate the CPUs that could be referenced, but it is not necessary to have that CPU... select the Smbios that you consider most appropriate. Reveal hidden contents You're right as usual. This build of mine works better with 19,1 but I used MacPro7,1 to install Tahoe and actually I started from usb with 20,1 Btw (maybe off topic) but in my case the best performance is with Sonoma rather than Sequoia. Ciao 3 Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2840805 Share on other sites More sharing options...
asapreta Posted September 17, 2025 Share Posted September 17, 2025 On 9/16/2025 at 9:41 AM, MaLd0n said: EFI XanthraX.zip -Delete old EFI folder and paste new then empty trash. Don't use merge files. -Don't use Drag and Drop into EFI partition. Use Copy/Paste instead. -Reset NVRAM one time - with OpenCore use entry "Reset Nvram" / with Clover use F11 key on boot screen. Would this work on a Gigabyte Z390 Gaming X motherboard? 1 Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2840809 Share on other sites More sharing options...
bluenote56 Posted September 17, 2025 Share Posted September 17, 2025 17 minutes ago, asapreta said: Would this work on a Gigabyte Z390 Gaming X motherboard? Why don't you try? Put the efi as suggested in a usb pen and start from that. 1 Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2840812 Share on other sites More sharing options...
XanthraX Posted September 18, 2025 Author Share Posted September 18, 2025 Thank you both. @deeveedee When need to make a new EFI, OCAT sends you here: https://github.com/5T33Z0/OC-Little-Translated/tree/main/F_Desktop_EFIs/Config_Templates where you find the templates and you can chose the one based on your CPU. Until now, my EFI's worked flawlessly for the rigs I have. For Coffelake they suggest iMac 19.1 or 19.2. I know OCAT let me to change the Mac model and to put everything on the list, but I did not want to risk. @bluenote56 I will put your EFI on a UBS stick and will try. Thank you both. Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2840835 Share on other sites More sharing options...
Anto65 Posted September 18, 2025 Share Posted September 18, 2025 58 minutes ago, XanthraX said: For Coffelake they suggest iMac 19.1 or 19.2. I know OCAT let me to change the Mac model and to put everything on the list, but I did not want to risk. Excuse me, but what's the risk if you try to put the generated EFI on USB and see if it boots ? 🙂 Yes, iMac 19.1 or 19.2 is correct for Coffeelake, but if you need to test for Tahoe, you need the "Skip Board ID check" patch in Booter (I personally use this configuration) or use a Smbios supported by Tahoe iMac 20.1 or 20.2 Another valid tool for generating an EFI, if you also have Windows installed, is OpCore-Simplify 1 Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2840837 Share on other sites More sharing options...
XanthraX Posted September 18, 2025 Author Share Posted September 18, 2025 Hi all. I did it. It is iMac 20.1 now, but I think it is cosmetic. Apple seems to not recognize my Hack as iMac 20.1. I cannot find Tahoe installer in Software Update, nor in MAS. The risk it took was to ruin my iCloud account. Now I had to sign up again in iCloud, in Adobe (and to remove the previous "iMac 19.1" from the account). Also in Setapp.com. Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2840843 Share on other sites More sharing options...
Anto65 Posted September 18, 2025 Share Posted September 18, 2025 If you want you can keep iMac19.1 and keep your ID by adding this patch in Booter booter-patch-config.plist.zip 2 Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2840844 Share on other sites More sharing options...
XanthraX Posted September 18, 2025 Author Share Posted September 18, 2025 On 9/16/2025 at 3:41 PM, MaLd0n said: EFI XanthraX.zip -Delete old EFI folder and paste new then empty trash. Don't use merge files. -Don't use Drag and Drop into EFI partition. Use Copy/Paste instead. -Reset NVRAM one time - with OpenCore use entry "Reset Nvram" / with Clover use F11 key on boot screen. Thank you. I use it now. After removing unnecessary kexts and inserting my boot args (agdpmod=pikera and uia_exclude for some USB's) 1 Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2840845 Share on other sites More sharing options...
XanthraX Posted October 14, 2025 Author Share Posted October 14, 2025 (edited) Hi everyone, I tried all versions, even an EFI made by me. Nothing works. It stalls only at the Apple logo, without the progress bar. I have to buy a new USB stick. I tried several times with one until even the BIOS not sees it as EFI bootable. Edited October 14, 2025 by XanthraX Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2842217 Share on other sites More sharing options...
Mac Hosehead Posted October 15, 2025 Share Posted October 15, 2025 Did you ever make it through a Tahoe installation with either computer? It does sound like your USB stick may have a problem. I have the same CPU and a similar motherboard. I have Tahoe installed with a MacPro7,1 SMBIOS. It should be possible. I am using an EFI from someone else that I modified a little. Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2842239 Share on other sites More sharing options...
XanthraX Posted October 15, 2025 Author Share Posted October 15, 2025 (edited) Hi, all I got after struggling was booting, but I get a black screen. No panics, no restarts. I attach here my config.plist. I tried to make it for iMac 20.1. I think I cannot get the proper specifications for the Radeon RX 560 video card. Maybe someone more experienced can help me. config.plist.zip 7 hours ago, Mac Hosehead said: Did you ever make it through a Tahoe installation with either computer? It does sound like your USB stick may have a problem. I have the same CPU and a similar motherboard. I have Tahoe installed with a MacPro7,1 SMBIOS. It should be possible. I am using an EFI from someone else that I modified a little. What graphic card are you using? Can you send me your config (obviously delete the serials at the "Platform Info" section)? I tried to make my own OC MacPro 7.1 but I got stalled here... (see image) Edited October 15, 2025 by XanthraX Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2842248 Share on other sites More sharing options...
Mac Hosehead Posted October 15, 2025 Share Posted October 15, 2025 You can try this EFI. I consider it to be a work in progress. I have it working on Z390 for Ventura, Sonoma, Sequoia, and Tahoe. It is just an EFI I downloaded from this site with a few changes. https://www.insanelymac.com/forum/files/file/1071-asus-prime-z390-a-tahoe-beta/ Notes: I have been trying out BCMC for Wifi but it is disabled in this config and DisableIOMap is set back to True. I have not tested Ethernet but it should work with this setting. I don't have Realtek Ethernet in the config but the kext is there. I have also removed AppleALC from the config. A Mod is needed to get that working in Tahoe but I use a Sound Blaster Play 3 instead. I have not really resolved USB yet and I have set USBInjectAll to True. I normally run without it. The OS will see my USB 3 without inject but not USB 2. It will sleep if I set it this way. I have WEG disabled and I am using a RX 6600 but my RX 470 also appears to work. Every once-in-a-while it will hang just before getting to the login and I have to restart. It seems to be related to the display card and also seemed to get better by using 2nd display slot. I'm not too positive, really. I took out the Serial #s in the config. There is still stuff left over that I think could be removed. Good luck! EFI.zip Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2842297 Share on other sites More sharing options...
XanthraX Posted October 16, 2025 Author Share Posted October 16, 2025 (edited) Thank you. I tried my EFI's from the same topic and I tried some changes. It stalls as I showed before. I also tried the iMac 20.1 also. It booted, but I cannot have video. I will try yours now. Thank you. It stalls here: "AppleKeyStore" :pid:77,sel:7:7947: unexpected session uid: -1 requested by: bluetoothd (77) "AppleKeyStore" :pid:77, :13093: operation failed (see: 7 ret: e00002c2, -1) "AppleKeyStore" :pid:77, :13093: operation failed (see: 7 ret: e00002c2, -1) I deleted your entry in the device properties and I added my videocard RX 560. I could install it. Now I can boot it with my iMac20.1 EFI, but I have no USB or blutooth. So I have no keyboard or mouse. I keep working. Anyway thank you @Mac Hosehead Edited October 16, 2025 by XanthraX Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2842318 Share on other sites More sharing options...
XanthraX Posted October 16, 2025 Author Share Posted October 16, 2025 I resolved the USB map from here: I post it to help others/ Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2842327 Share on other sites More sharing options...
XanthraX Posted October 17, 2025 Author Share Posted October 17, 2025 (edited) Finally it is a success, but it is not yet my main system. I ordered 2 fullmac BCM9360 wifi cards and 2 adapters for them. But I wait for a proper version of OCLP. The now-a-day methods requires SIP ON, but the VoodooHDA requires SIP off (deadlock!). Also, the update to 26.01 needed alternatively 2 EFI's. I hope in the next future it will be the same easy how is actually with Sequoia. Many thanks to all who helped me. Too bad, my MoBo has only one NvME slot. If anyone else needs help with this mobo, I will help. Edited October 17, 2025 by XanthraX 2 Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2842401 Share on other sites More sharing options...
Slice Posted February 21 Share Posted February 21 Nothing requires SIP ON. 2 Link to comment https://www.insanelymac.com/forum/topic/361684-is-it-possible-to-install-macos-tahoe-on-coffeelake-cpu/#findComment-2847604 Share on other sites More sharing options...
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