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Hello Revans, i don't know if you still on this forum ; i have a 450 G6 and try your EFI, everything works great but i've got a strange issue : the wifi doesnt show any wifi spot. The wifi card AX210 is ok but it show nothing. Any idea ? JM Edit : i finaly make it work after several test...

Hello, It was a long time i don't came here. I bought a 450 G6 this week and try to install catalina on it. since I have a probook 4540s with catalina which working very well, i was thinking it would be not so difficult. Unfortinately, i have a bios issue : i cant boot on the usb key because the...

Hello Rehabman, I have run the Osx installer and nothing change : still no sound. Very strange because it worked well before this new instalation. Maybe because it's 10.11.6 ? Thanks JM

Hello all, @ Rehabman, I have try to restore AppleHDA without succes : I extract it from the installer using Pacifist and after that Kexthelper but still have the same problem with no sound. Thanks JM

Hello RehabMan, Thanks for the answer. How do i restore AppleHDA ? Thanks Jean-Marc

Hello, I used to use my El Capitan Probook 4540s for a year and everything was fine. Récement I tried installing Sierra and having found that all was not stable, I decided to return to El Capitan. I tested the method of Clover UEFI Hotpatch and also the Probook software installer. every time I...