![]() ![]() Then I copied it's AMD named Kexts files from 'Extensions' directory in flash drive and placed them in Mid 2011 machine where I had laggy display issue. Here everything worked fine including brightness, sleep and GPU acceleration even used after effects and rendered some videos too. Then I installed Catalina from same usb drive on another iMac (21.5-inch, Mid 2010) it has "ATI Radeon HD 4670 256 MB" graphic card. I tried kexts files solution using Kext Utility & hackingtool which places files in "/System/Library/Extensions" it didn't show any luck. i got no hardware acceleration which made my graphics performance laggy poor, sleep & brightness functions didn't work either. As it has "AMD Radeon HD 6750M 500MB" graphic card so GPU didn't work. ![]() I installed successfully Catalina using dosdude1 patcher on my iMac (21.5-inch, Mid 2011).
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