Hpbrown Posted November 15, 2020 Share Posted November 15, 2020 Hi I’m currently using a Latitude 7400 with Catalina using Clover. i would like to upgrade to Big Sur but need to upgrade to OpenCore first. Has anyone done it already? If yes , could you please share your EFI folder ? Thx Link to comment Share on other sites More sharing options...
Administrators Hervé Posted November 15, 2020 Administrators Share Posted November 15, 2020 Or you could have a go at it with a USB key by following Dortania's guide. Link to comment Share on other sites More sharing options...
Hpbrown Posted November 16, 2020 Author Share Posted November 16, 2020 thanks Hervé. I've followed carefully step by step. I'm booting and everything works fine. Even the TrackPad and buttons which were not working properly under Clover are now fully functional. Only issue is the About This Mac which does not seem to pick properly the model and serial number. Any obvious reason when looking at my EFI folder attached.? Also I'm wondering if the Audio solution is the best one given that the Jack does not work (but it didn't either in Clover..) Next step when system is stable to upgrade de Big Sur thanks EFI.zip Link to comment Share on other sites More sharing options...
Hpbrown Posted November 17, 2020 Author Share Posted November 17, 2020 I manage to fix the serial issue using UpdateSMBIOSMode as Custom instead of Create (which was the default).. How to enable Fn6 / Fn7 keys to adjust the brightness controls? thanks Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted November 17, 2020 Moderators Share Posted November 17, 2020 Are you sure it has ALC295 as audio codec? Post IOReg file with IORegistryExplorer.app Try the following config and SSDT added to your Config for Fn keys 7400_BrightnessKey.zip Link to comment Share on other sites More sharing options...
Hpbrown Posted November 17, 2020 Author Share Posted November 17, 2020 Thanks Jack. I will test this later today and report here's the IOReg file MacBook Pro.zip Link to comment Share on other sites More sharing options...
Administrators Hervé Posted November 17, 2020 Administrators Share Posted November 17, 2020 ALC295 indeed. Link to comment Share on other sites More sharing options...
Hpbrown Posted November 17, 2020 Author Share Posted November 17, 2020 Hi Jack, the brightness controls with the Fn key do not work with your SSDT. I think that I can live without..thanks for trying anyway I have another issue. When launching the Big Sur installation via software update, the app starts then fails at 12min exactly prompting to reboot the system. In fact, the system doesn't reboot, it's just restarting the Finder. any idea what could cause this issue or a workaround to this install process? I've tried several times and it fails constantly at 12min Should I try to upgrade running the Big Sur installer from a Mac.? Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted November 17, 2020 Moderators Share Posted November 17, 2020 Have you tried layout-id 3, 13, and / or 15 for audio? Have you tried rebooting manually and see if there's a new boot option? You can download a full app from your 7400 and create an USB installer. Boot from your current EFI and select the Installer from the picker Link to comment Share on other sites More sharing options...
Hpbrown Posted November 17, 2020 Author Share Posted November 17, 2020 Hi Jack. I ended up installing Big Sur using a USB installer. WiFi, BT, TrackPad incl buttons fully working!. I'm a happy user especially after this painful install process. When you say to try the layout-id, is this in the boot args or using the device properties device injection process? I will do further testing but seems so far that the only non working parts are the brightness controls with Fn keys and audio jack. I would love to fix those but as I said, I can easily live without Link to comment Share on other sites More sharing options...
Recommended Posts