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Procedure to update from Yosemite
to El Capitan
1. Press F4 at Clover screen.
2. Run latest PBI CE and update Clover, kexts, DSDT, config.
3. Restart to check if you're still alive
4. Go to /System/Library/Extentions/, look for BrcmPatchRAM.kext. If you see it, remove it.
5. Go to AppStore, download and install El Capitan, the installer will tell you to restart.
6. When it restarts, select the new boot option in Clover screen to install.
7. When everything is don't, rerun PBI CE to repatch DSDT, generate config.plist, update kexts, bluetooth kext and use Kext Wizard to repair permission, rebuild cache a few times to make it really stable.