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Thank you very much, @quynkk5! I am attaching the DSDT dumped from my Latitude E7490 which is the one on which I am trying to install Big Sur right now. Do you think there is something wrong with the SSDTs and you are going to create and send me the correct ones? I am planning on hackintoshing a couple more computers, so if you could help me understand how to prepare correctly the SSDTs, I would much appreciate it. In case it is too complex for a proper explanation or a couple of links to read and learn, would you please also help me with the Latitude 3390 I'll try to hackintosh right after the 7490? I am attaching the dumped DSDT of the 3390 too. Once again thank you very much! DSDTs Latitude E7490 and 3390.zip

Dell Latitude E5550: Intel Broadwell i3-5010U @2.10GHz Intel HD5500 graphics 8GB DDR3L RAM Intel I218V LAN Intel AC 7265 Wireless OpenCore 0.7.3 and Clover r5138 with up-to-date kexts at time of writing. Updated: Dell Latitude E5550.zip Working: Full graphics acceleration HDMI output Wifi and Bluetooth LAN Audio (speakers, headphones & HDMI) Sleep with lid off and  > Sleep Brightness control Multimedia button Keyboard and touchpad (ALPS) SD card reader USB2.0 & USB3.0 ports (USB remapping required macOS installation because my laptop doesn't have camera so I've not remapped yet) Battery Indicator and charger Not working: VGA output (unsupported)