what about 6520 on El Cap,
i've done everything that is said here :
https://osxlatitude.com/index.php?/topic/8506-dell-latitude-inspiron-el-capitan-clover-guide/&do=findComment&comment=54632
using the :
-----------------------
Legacy - GUID Scheme - See Note1 below
- SandyBridge
E6420.zip
------------------------
but still it doesn't work, when I boot from my USB installer I don't se anything connected to the SATA port of my computer
(and yes, I did a BIOS default + data as AHCI step).
Vincent.
::edit:: exact spec is :
Latitude E6520 with
BIOS A19
i7 2620 @2.7GHz
Intel HD Graphics
8 GB RAM
256 GB SSD