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latitude 7480 Mojave 10.14.6 upgrade for Big Sur


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I've been working fine with Mojave 10.14.6, most devices work like:
Wifi (intel with itlwm.kext & Heliport)
LAN (Intel)
USB ports

They do not work:
Brightness controls
Micro SD reader
I want to know what is the procedure to update to Big Sur, hoping that everything works without problem.
What are the steps =?
My configuration is based on Clover - Olarila


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