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hello. i decided to upgrade my system and I used Jake Lo's guide: https://osxlatitude.com/index.php?/topic/8506-dell-latitude-inspiron-precision-el-capitan-clover-guide/&do=findComment&comment=54632 allmost everything works fine when using USB for boot, but when I try to boot from disk, i loose USB-ports. So what is wrong? this is first time using Clover so it's quite confusing how to set up the machine, installer and where to install and copy things. f.e. any help is appreciated stupid questions will follow, maybe some other newbie as me have same questions... so here we go: 1 How do i have to set up the settings etc to get everything work from HDD? for Latitude E6420 Nvs4200M i used Legacy options - (in the guite: For Exx20 (SandyBridge models), use Legacy - GUID Scheme. Not UEFI) do I have to make USB installer using Legacy or UEFI Boot Sequence in BIOS? or it does not make a difference? When installing Clover (version Clover_v2.3k_r3320) into the USB installer I used only: Install Clover in the ESP Bootloader/Install boot0af in MBR CloverEFI/CloverEFI 64-bits SATA Preference panel is it right? or i need to install RC scripts also? weird, when booting it shows newer version of Clover than 3320. ??? 2. I Used Generic EFI folder (EFI.zip) + E6x20 NVS.zip (downloaded from the same page). It took a while figuring out where to put file in E6x20 NVS.zip. At last i checked original EFI folder before replacing EFI folder for new one - it helped to figure out things a little bit. Still questions: where do i have to put the kexts in folder Other. Leave them as they are (Other folder) or make a 10.11 folder in the USB stick’s EFI partition? /Volumes/EFI/EFI/CLOVER/kexts/Others ? or /Volumes/EFI/EFI/CLOVER/kexts/10.11 ? 3. When installing El Capitan into the harddrive same questions raised: ido i have to install sing Legacy or UEFI Boot Sequence in BIOS? or it does not make a difference? installing Clover into the hard drive i used only: Install Clover in the ESP Bootloader/Install boot0af in MBR CloverEFI/CloverEFI 64-bits SATA Preference panel is it right? or i need to install RC scripts option also? 4. When generating ssdt.aml with ssdtPRGen.sh where do i have copy the ssdt.dsl ? 5. In /Volumes/EFI/EFI/CLOVER/ACPI/patched is dsdt.aml file. how do i generate a new one? or it’s not a must do thing? 6. Where do i have to put config.plist? I modified the one which is on EFI partition (in CLOVER folder). 7. when copying kexts to hard drive: where do i have to put the kexts in folder Other. Leave them as they are (Other folder) or make a 10.11 folder in the USB stick’s EFI partition? P.S. it seems that one of the generators needs internet connection to work properly! 8. When using EFI Mounter app do i have to unmount the volumes before proceeding? anyway, thank you Jake Lo and others for the great installer guides and tips! any help is appreciated. _____ Intel Core i5 2520M (integrated Intel HD Graphics 3000) 8 Gb RAM NVIDIA NVS 4200M HiRes 1600x900 LCD WIFI - Qualcomm Atheros AR3011 (not working yet, using WIFI stick) bios A22 I think it is Sandy bridge version. Optimus is disabled in BIOS.