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I've installed BigSur successfully on my laptop dell 3442 A-15 with opencore following dortania's Haswell guide (first time trying opencore, before I did it on Catalina with clover and it works). There are some problems and I would like some help to solve... Working: - trackpad, intel graphics 4400 and only 1/3 USB port Don't working: - laptop keyboard, Bluetooth, WiFi, network connection via cable, sound, 2/3 USB ports (I didn't made USB mapping yet) I tried olaria premade EFI for Haswell, but the only thing that works is the 3/3 USB ports. Link: https://tinyurl.com/36pjy29u My EFI: https://mega.nz/file/rDo1zapT#gwd6C1h3M3p67Y7rnlTZ2QryY0ntsr__XxCK3o7-05g